10" f/8 Ritchey-Chrétien carbon fiber optical tube

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Astro-Tech Ritchey-Chrétien optics
Optical features of this Optical Tube . . .
  • Ritchey-Chrétien optical design: This Astro-Tech optical tube is a true Ritchey-Chrétien (R-C) reflector optical system. Unlike a Maksutov-Cassegrain or Schmidt-Cassegrain catadioptric scope (that uses simple spherical mirrors and corrector lenses), or Newtonian reflectors (that use a coma-producing parabolic primary mirror), this Astro-Tech R-C is a Cassegrain-type two-mirror optical system that uses a concave hyperbolic primary and a convex hyperbolic secondary mirror to form its images. These sophisticated and difficult-to-make mirrors combine to produce images at the Cassegrain focus at the rear of this Astro-Tech scope that are free from coma and spherical aberration, with a smaller spot size, over a much wider field than conventional Newtonians or catadioptrics. The images are likewise free from the chromatic aberration found in refractors and some catadioptrics.
        Because of this wide coma-free field, small spot size, and relatively fast focal ratio, the Ritchey-Chrétien design is particularly well suited to astrophotography, rather than visual observing. For imaging, the R-C is the optical system of choice for most of the major professional observatory imaging telescopes built in the last half-century. For example, the Hubble Space Telescope, the twin 10-meter Keck telescopes in Hawaii, and the four 8.2 meter telescopes of the Very Large Telescope array in Chile are all Ritchey-Chrétiens. For serious amateur astronomers and astrophotographers without NASA’s optical budget, an Astro-Tech R-C is likewise the imaging system of choice.

  • Fully multicoated quartz and BK7 mirrors: The primary mirror of the 6” Astro-Tech is first-quality BK7 optical glass, while the 8” and larger Astro-Tech R-Cs use primary mirrors of low thermal expansion quartz for maximum focus stability during long exposure imaging sessions. Both 6” R-C mirrors are vacuum-coated with enhanced aluminum for high reflectivity and overcoated with a durable layer of silicon monoxide (quartz) for long life. The 8” and larger mirrors are dielectric multi-coated for long life and reflectivity approaching 99%+.

  • Computer designed and fabricated optics: To keep the cost of each Astro-Tech R-C so reasonable when compared to competitive R-C scopes, the computer-optimized Astro-Tech hyperboloid mirrors are automatically ground and finished to very high tolerances using custom-made computerized mirror grinding machines. This precision computer control guarantees an exact repeatability of figure from mirror to mirror that is difficult to achieve using more costly conventional hand figuring. After grinding and polishing, each mirror is individually tested multiple times during fabrication using Zygo interferometers to assure that it meets or exceeds its designed performance standards.

  • Frill-free design: To further keep its cost reasonable, an Astro-Tech R-C does away with most of the bells and whistles found on competitive scopes that add little to their performance (but much to their cost). For example, Astro-Tech front and rear cells are first die-cast, then CNC machine-finished, rather than completely CNC machined from raw stock at considerably greater expense but no significant improvement in performance as is the case with other R-Cs. Glare stops in many of the optical tubes are a molded insert, rather than machined aluminum, resulting in a significant savings in cost at no appreciable difference in performance. The Astro-Tech scopes use an external manual dual-speed Crayford focuser, rather than the considerably more complicated and much more costly motorized movable secondary mirror system that other manufacturers use for focusing. The result of the Astro-Tech no-frills approach is genuine Ritchey-Chrétien wide-field performance at a fraction the cost of other commercial R-C systems. While the mechanical bells and whistles may be limited in an Astro-Tech R-C, an Astro-Tech scope still has the high precision flat field/coma-free true Ritchey-Chrétien optics that are the most important reason for buying an R-C scope.
Mechanical features of this Telescope’s Optical System . . .
  • Fixed primary mirror with computer optimized primary and secondary baffling: Unlike traditional Cassegrain designs that move the primary mirror fore and aft along the central baffle tube in order to achieve focus (which can lead to image shift and focal length changes as the mirror position is adjusted) each Astro-Tech R-C primary mirror is fixed at the precise focal length required for optimum sharpness. The Astro-Tech is focused externally by means of a dual-speed 2” Crayford-style focuser on the rear cell, thereby eliminating a Cassegrain’s moving mirror image shift and focal length change during focusing. Molded field stops are installed along the interior of the optical tube to effectively prevent stray off-axis light from reaching the image plane, resulting in improved contrast. In addition multiple glare-stop microbaffles on the inner surfaces of the primary mirror baffle tube and the secondary mirror light shield further prevent off-axis light from reaching the image plane, resulting in still further improved contrast.

  • Collimatable secondary mirror: Since the primary mirror of an Astro-Tech R-C is fixed in position, only the secondary mirror can (or needs to) be collimated. This makes it easy to keep the Astro-Tech RC optics aligned for peak performance. Collimation adjustments to the secondary mirror are made by adjusting the three collimating screws in the back of the secondary mirror holder.

  • Cooling fan: The open tube R-C design allows for fast cool-down of the primary and secondary mirrors. Built-in fans on the rear cell of the 10” and larger scopes increases the air-flow around the optics to achieve still quicker “cool down” times of the larger primary mirrors. The 6” and 8” scopes do not have primary mirror cooling fans, as their mirrors are small enough to cool down quickly without any external aid.
Developed by Astro-Tech to make large-format CCD imaging affordable for the amateur astronomer, the Astro-Tech AT10RCF – a Sky & Telescope Hot Product for 2010 – is priced thousands of dollars less than the formerly least-expensive 10” R-C. The Astro-Tech AT10RCF is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Even better, despite its low price, the Astro-Tech-developed AT10RCF has many of the same premium features as the much higher-priced competitive RCs (and some they don’t have) – like quartz mirrors, dielectric mirror coatings, carbon fiber body, and more.

This Astro-Tech AT10RCF Ritchey-Chrétien astrograph has:

• 10” f/8 true Ritchey-Chrétien hyperbolic mirror optical design
• low thermal expansion quartz primary and secondary mirrors
• 99% reflectivity non-tarnishing multi-layer dielectric mirror coatings
• center spotted secondary mirror
• low thermal expansion carbon fiber optical tube
• nine contrast-enhancing main tube knife edge light baffles
shipped without focuser to allow you to add the premium focuser of your choice
• 1” and 2” focuser extension rings to fine-tune the back focus of your optional focuser
• three built-in cooling fans in rear cell
• two Losmandy-style “D-plate” dovetail rails
• mounting bracket for optional finder
• two-year warranty

    The 10" Astro-Tech AT10RCF is the first truly affordable carbon fiber large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Imitators will no doubt copy Astro-Tech’s years of hard development work, but why settle for a copy when you can get the original? Sky & Telescope agrees, as they named the Astro-Tech 8” and 10” Astro-Tech Ritchey-Chrétien astrographs Sky & Telescope Hot Products for 2010. (Incidentally, the original Astro-Tech 6” R-C was named a Sky & Telescope Hot product for 2009 and the new 12" AT12RC has been named a Hot Product for 2011.)

    The surprisingly affordable Astro-Tech AT10RCF (and its even more affordable metal tube brother, the AT10RC) joins two other Astro-Tech Ritchey-Chrétien firsts. One is the AT8RC, a Sky & Telescope Hot Product for 2010 – the first 8” true Ritchey-Chrétien astrograph available from a U. S. company and the first and still the only affordable U. S. 8” R-C with Astro-Tech-designed premium features like quartz mirrors, dielectric mirror coatings, two dovetail mounting rails, and more. The other is the AT6RC – a highly affordable R-C astrograph for webcam, DSI, and DSLR imaging that was conceived and developed by, and first brought to market by, Astro-Tech and named a Hot Product for 2009. Both the AT6RC and the AT8RC were highly praised in a four-page review in the December 2009 issue of Sky & Telescope magazine.

    And we are serious when we say the 10” aperture AT10RCF is “affordable.” The premium feature carbon fiber Astro-Tech AT10RCF is priced thousands of dollars less than the formerly least-expensive phenolic tube 10” R-C. As Sky & Telescope pointed out in their Hot Product citation in the January 2010 Sky & Telescope, “Ritchey-Chrétien reflectors are highly regarded among today's elite astrophotographers, and premium instruments often carry price tags starting at about $1,000 per inch of aperture. So it's the best kind of "sticker shock" to see the prices for Astro-Tech's 8- and 10-inch f/8 Ritchey-Chrétiens, which pack features too numerous to list here. Our review of the 8-inch scope appears in last month's issue (December 2009), page 38, and our initial hands-on look at the 10-inch suggests that it will be equally exciting for deep sky astrophotographers." The magazine also pointed out that the 10" Astro-Tech RC cost “about one-fourth what similar instruments did just a couple of years ago.”

    The Ritchey-Chrétien optical design is used in virtually every recent large mega-million dollar professional observatory telescope – including the Hubble Space Telescope. The Astro-Tech AT10RCF astrograph (a telescope designed specifically for astronomical imaging, rather than visual observing) makes the coma-free imaging of true Ritchey-Chrétien optics available to the DSLR and large format CCD astrophotographer at a price less than that of many large format CCD cameras and DSLR camera bodies. Featuring first-quality 99% reflectivity dielectric mirror coatings and premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this economical 10” Astro-Tech carbon fiber R-C makes you wonder just what competitive high-price R-Cs have that makes them cost so much more.

    Designed for exceptional imaging, the Astro-Tech AT10RCF provides the coma-free photographic field that large format CCD astrophotographers crave, but can’t get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT10RCF has a wide spectral response and is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with an 10” aperture that dwarfs the light gathering of most apo refractors.

    An example of the kind of imaging possible with the AT10RCF is Brian Kimball’s exceptional image of NGC2244 shown below in the “images of some features” section. This open cluster of young stars is nestled within the Rosette Nebula, and was recently formed from that nebula’s material. Brian’s AT10RCF image easily stands up to a side by side comparison with photos taken by professional observatories using much larger and more expensive telescopes, as well as to those taken with the most expensive amateur astrographs.

    If serious astrophotography is your goal, but the price of most true Ritchey-Chrétien optics has been keeping you from the optical design used by most modern professional observatories and the Hubble Space Telescope for their imaging, your wait is over. The 10” Sky & Telescope Hot Product for 2010 Astro-Tech AT10RCF astrograph can bring the world of professional DSLR/CCD deep space imaging to your backyard observatory at a truly affordable price.

Features of this Astro-Tech AT10RCF Astrograph . . .

  • Optical design: True Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. For more details, click on the “optics” icon above. The 235mm available back focus allows for the use of long CCD equipment trains.

  • Optical specifications: 10” aperture, 2000mm focal length, f/8 focal ratio.

  • Hyperboloid primary mirror: Made of low thermal expansion quartz, rather than the Pyrex used by competitors. Ground and polished under precision computer control. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift as the mirror position changes) the AT10RCF primary mirror is fixed to eliminate both a catadioptric’s image shift and the frequent primary mirror collimation requirements of a Newtonian reflector. Collimation is pre-set at the factory but can be adjusted, if needed, using three traditional push/pull locking adjustment screw sets.

  • Hyperboloid secondary mirror: Made of low thermal expansion quartz, rather than the Pyrex used by competitors. Ground and polished under precision computer control. Mounted in a four-vane spider and fully collimatable using simple standard Cassegrain reflector collimating techniques. The secondary mirror is precisely center-spotted to make collimation easier. Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT10RCF secondary mirror is fixed and focusing is done externally.

        The December 2009 issue of Sky & Telescope said that the Astro-Tech R-C’s fixed primary and secondary mirrors “eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain’s primary and secondary mirrors."

  • 99% reflectivity dielectric coated optics: Both primary and secondary mirrors have non-tarnishing state-of-the-art multi-layer dielectric mirror coatings. These have a full 99% reflectivity for the brightest possible images. This is higher than the unspecified (but typically 94-96%) reflectivity of the enhanced aluminum coatings used by competitors.

  • Multiple internal light baffles: Computer optimized primary and secondary baffling. Nine contrast-enhancing glare-stop knife-edge baffles in the optical tube; multiple glare-stop microbaffles in the secondary mirror light shield; baffles in the primary mirror baffle tube, and baffles in the focuser drawtube, provide truly dark sky backgrounds during imaging.

  • Carbon fiber optical tube: Made of a high strength woven carbon fiber-reinforced epoxy-coated composite with extremely low thermal expansion characteristics to reduce the possibility of temperature-related focus changes during an exposure that can occur with aluminum or rolled steel tube systems. Die-cast and machined aluminum front and rear cells. The carbon fiber tube is dent-proof and virtually indestructible. Carbon fiber composites are so strong that the new $200,000,000 Boeing 787 Dreamliner passenger jet will use a wing and fuselage made almost entirely out of carbon fiber.

        The December 2009 issue of Sky & Telescope said of the carbon fiber tube used in the 8" Astro-Tech RC, "the carbon-fiber tube did a good job of holding focus over the modest temperature changes occurring during my summer evenings. More telling, perhaps, was the scope’s tendency to remain accurately focused after several days of inactivity during which the temperature in my backyard observatory would cycle over a huge range."

  • No focuser is supplied: Many astro-imagers already have a premium focuser being used on another scope that they would like to use for imaging, or they have a preference for one particular focuser manufacturer over another. Rather than pre-installing a focuser of our choosing, and to give you the most flexibility in choosing your own focuser for imaging, no focuser is supplied with the AT10RCF. This allows you to choose your own focuser, depending on your preferences. One possible choice might be the dual-speed 3" Feather Touch #3015 rack and pinion, with #M117 adapter (#3015/M117).

        The rear cell of the AT10RCF has a male 117m x 1mm pitch threaded port for attaching a focuser. The standard Feather Touch 3” diameter 1.5” travel focuser normally comes with a 109mm threaded collar for connecting to a scope. However, in its #3015 configuration (Feather Touch part #FTF3015B-A), it also requires a #M117x1 Feather Touch adapter to be used with the AT10RCF. The #3015 focuser (without 109mm collar) slips into this adapter and is held in place by three large brass Delrin-tipped retaining knobs. Only focusers with a maximum 1.5" drawtube travel, such as the Feather Touch #3015, are recommended for use with the Astro-Tech AT10RCF 10" Ritchey-Chrétien. For brands of focusers other than Feather Touch, such as MoonLite, contact the focuser manufacturer for an adapter to fit the 117mm x 1mm port on the rear of the scope.

        To fine-tune the back focus of the AT10RCF to the requirements of your camera and equipment train, three threaded extension rings (two 1" in length and one 2") are provided to install singly or in combination between the AT10RCF rear cell and the focuser of your choice. These provide a flex-free solid metal extension that changes the distance between the focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging. The two 6.4 ounce 1” extension rings and one 14.4 ounce 2” ring add 1.7 pounds to the weight of the scope when all rings are installed.

        Because of the 33.6 pound weight of the AT10RCF (without extension rings, but with a typical focuser), plus the weight of your ancillary camera equipment and any photoguide scope, installing the AT10RCF on a German equatorial mount with a 60 to 100 pound payload capacity is recommended. Such mounts include the 90 pound capacity Celestron CGE Pro and the Losmandy 60 pound capacity G11 or G11 go-to and 100 pound capacity Losmandy HGM Titan. Other suitable mounts are also available.

  • Optional field flattener: For even more impressive coma-free imaging with the AT10RC, consider adding the Astro-Tech AT2FF field flattener. While not specifically designed to work with Ritchey-Chrétien astrographs, images taken with the field flattener by Astro-Tech R-C owners have shown that the Astro-Tech 2" field flattener works remarkably well with these advanced coma-free reflectors as well as with refractors. This modestly-priced imaging accessory essentially eliminates the residual field curvature inherent in all reflector telescope designs, so that the coma-free star images remain point-like all across the field. An optical analysis and ray tracing of the field flattener was done in ZEMAX and applied to the R-Cs by Roger Ceragioli, the noted optical designer who did the final optimization of the Astro-Tech Ritchey-Chrétien optics. Here is what he had to say about the #AT2FF, “My conclusion, which seems supported by what users are saying, is that you don't need any other field flattener. This one performs well over a 40mm image circle in all three small RCs (6", 8", and 10")."

  • Cooling fans: To allow the AT10RCF to reach ambient temperatures more quickly for optimum imaging performance, there are three small low vibration/high CFM primary mirror cooling fans built into the rear cell. The high speed DC fans are powered by a standard equipment battery pack that plugs into a jack on the rear cell. The battery pack uses eight user-supplied AA batteries. An optional external DC power supply, such as a rechargeable 12VDC battery pack can also be used to power the fans.

  • Two dovetail mounting rails: Two Losmandy-style “D-plate" dovetail rails are provided for installing the AT10RCF on an equatorial mount, as well as for mounting optional accessories (such as rings for a photoguide scope) on top. The 21” long dovetail rails run the length of the optical tube. One is mounted underneath the tube for installing the 33.6 pound AT10RCF directly on a suitable payload capacity Losmandy-style equatorial mount. The second dovetail rail is mounted 180° away from the first, on top of the tube. This can be used for installing a photoguide ring set, piggyback camera adapter, or any other accessory that attaches to a scope by means of Losmandy-style “D-plate" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength, as can be seen in the side-view feature image below.

  • Finderscope dovetail: A Vixen-style finderscope bracket dovetail base is installed on the upper left side of the optical tube's rear cell. It can easily be removed if not needed. It will accept Vixen-style finderscope brackets as well as red dot-type finders, such as the Astro-Tech #ATF.

  • Other accessories: A snap-in dust cap is standard.

  • Two year warranty: As an expression of the confidence Astronomy Technologies has in the quality of their products, the Astro-Tech AT10RCF is protected by a two-year limited warranty against flaws in materials and workmanship.
Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

2000mm
Focal Ratio:
This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

An f/5 system can photograph a nebula or other faint extended deep space object in one-fourth the time of an f/10 system, but the image will be only one-half as large. Point sources, such as stars, are recorded based on the aperture, however, rather than the focal ratio – so that the larger the aperture, the fainter the star you can see or photograph, no matter what the focal ratio.

f/8
Resolution:
This is the ability of a telescope to separate closely-spaced binary stars into two distinct objects, measured in seconds of arc. One arc second equals 1/3600th of a degree and is about the width of a 25-cent coin at a distance of three miles! In essence, resolution is a measure of how much detail a telescope can reveal. The resolution values on our website are derived using the Dawes’ limit formula.

Dawes’ limit only applies to point sources of light (stars). Smaller separations can be resolved in extended objects, such as the planets. For example, Cassini’s Division in the rings of Saturn (0.5 arc seconds across), was discovered using a 2.5” telescope – which has a Dawes’ limit of 1.8 arc seconds!

The ability of a telescope to resolve to Dawes’ limit is usually much more affected by seeing conditions, by the difference in brightness between the binary star components, and by the observer’s visual acuity, than it is by the optical quality of the telescope.

0.46 arc seconds
Aperture:
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
10"
Back Focus:
9.25” (235mm)
Weight:
The weight of this product.
33.6 lbs.
Telescope Type:
The optical design of a telescope.  Telescope type is classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, or by the task they perform.
Ritchey-Chrétien
Warranty:
2 years
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1. John on 3/11/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
ASTRO TECH 10” RC ASTROGRAPH
By John O’Neill
john@oneilladvertising.com



While reading Astronomy Magazine and looking at an ad by Astronomics about a new true RC scope, with quartz mirrors, carbon fiber tube, and baffling all for under $4,000. I couldn’t believe my eyes. Could this be? There has to be something wrong with these scopes to go for that price. Happily I can state without reservation that I have found what I was searching for. I need not look any further (unless I win the lottery).

First, I bought the AT6RC and it was love at first sight. The scope is extremely well made and optically a marvel, not to mention the great price. A perfect fit for my Olympus Evolt.

This review will be on the production model Astro Tech 10” RC Astrograph; a f/8 true Ritchey-Chrétien hyperbolic mirror optical design, carbon fiber tube (aluminum tube is also available) with nine knife edge baffles, low thermal expansion quartz mirrors with dielectric mirror coatings (primary and secondary), 3 cooling fans, a robust mirror cell and Losmandy “D” mounting plates top and bottom. The RC’s have fast optics. At f/8, the 10” scope is a very desirable 2000mm, add a .75x reducer/flattener you can get the scope down to a very fast f/6 at 1500mm. Even at f/6 the limited tests I did using my Evolt showed a sharp field right to the edges.

I found the workmanship to be top notch in fact the scope made Sky and Telescopes hot product list for 2010. The carbon fiber and back plate with cooling fans looks terrific. I recommend the carbon fiber over the aluminum tube because of temperature stability (focus and forget) and ease of disassembly, if ever needed.

Initially when the scope first came out, there was a buzz about the collimation of the scope. The truth is the RC is NOT hard to collimate but the RC design does demand that you have near perfect collimation. There has also been an issue for those using large chip cameras with strange flat fields. Adding flat black to their extension rings and adapters, etc. solved the problem. The central obstruction is big but a necessary evil of the RC design. The scope is not heavy, but a good-sized mount will help if imaging.

Almost all of my previous scopes had inherent problems such as mirror flop, causing major focus problems; The AT10RC has a fixed primary, and no meniscus to degrade the image.

The scope is not perfect but for the price, it has to be the best value out there. Most RC’s have a cost per inch of $1,000 or more. Then you have to purchase expensive accessories to bring it up to full working order. No so with the AT10RC scopes. They work great right out of the box. You can pay $10,000 for a 10” RC or you can pay $3,500 for an Astro Tech RC.

The RC scope is primarily aimed at the astro imaging community but observing through the scope is also a joy. At f/8 the field is bright and stars are pinpoints to the edge. The best of both worlds’
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General Accessories
Finderscopes (2)
Illuminated multiple reticle finder
by Astro-Tech
Quantity:  
$59.95 
Vixen-Style mounting bracket for Astro-Tech multiple reticle finder
by Astro-Tech
Quantity:  
$10.00 
Visual Accessories
Dewcaps and Lens Shades (1)
Flexible black plastic for the 10" Astro-Tech AT10RC RC astrographs, with two notches
by Astrozap
Quantity:  
$52.00 
Photographic Accessories
Collimating Tools (1)
Focuser collimating ring for 10" and 12" Astro-Tech Ritchey-Chrétiens
by Astro-Tech
Quantity:  
$99.95 
Focusers (2)
Feather Touch 3" Manual rack and pinion focuser and 117mm adapter
by Starlight Instruments
Quantity:  
$794.00 
117mm x 1mm pitch adapter to put Feather Touch Focuser on Astro-Tech 10" and 12" RC astrographs
by Starlight Instruments
Quantity:  
$164.00 
Tele-Compressors (Photo/Visual) (1)
2" Field flattener for imaging with Astro-Tech and TMB refractors
by Astro-Tech
Quantity:  
$150.00 
• 1” and 2” focuser extension rings to fine-tune the back focus of your optional focuser 
• three built-in cooling fans in rear cell 
• two Losmandy-style “D-plate” dovetail rails 
• mounting bracket for optional finder 
Documents
Astro-Tech - 10" Ritchey-Chretien manual 1749 KB
Astro-Tech - 10" RC collimation sheet 455 KB
Videos
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Astro-Tech - 10" F/8 Ritchey-Chrétien carbon fiber tube astrograph body only

Click icon(s) below & hover image above for zoom

Astro-Tech - 10" F/8 Ritchey-Chrétien carbon fiber tube astrograph body onlyLarge image of the rear cell of the Astro-Tech AT10RCF, with a 25 cent coin (24mm diameter) to show the relative size of the scope.Larger image of the front of the Astro-Tech AT10RCF.Image of the rear cell of the Astro-Tech AT10RCF, showing all supplied accessories (except front cell dust cover).The rear cell of the Astro-Tech AT10RCF showing the focuser components, cooling fans, primary mirror push/pull collimation screw sets, power input jack for fans, and finder bracket.Close-up of Feather Touch focuser on Astro-Tech AT10RCF.Close-up of extended focuser, cooling fans, power input jack for fans, and push/pull collimation screw sets of the Astro-Tech AT10RCF.The front cell of the Astro-Tech AT10RCF, showing the internal light baffles and the secondary mirror holder and spider vanes.IC 1396, the Elephant's Trunk Nebula, by Brian Kimball, using an AT10RC, SBIG STL-11000, and Astrodon Gen II filters. This was a cover image on the Astronomical League's Reflector magazine March 2011.AT10RC image of a portion of IC 1805, the Heart Nebula, by Brian Kimball, using an SBIG STL-11000 camera with Astrodon Gen II filters.AT10RC image of IC 5146, the Cocoon Nebula, by Brian Kimball, using an SBIG STL-11000 camera with Astrodon Gen II filters.AT10RC image of NGC 6992, the Eastern portion of the Veil Nebula, by Brian Kimball, using an SBIG STL-11000 camera with Astrodon Gen II filters.John O'Neill's AT10RC image of the very faint reflection nebula VDB 152 in Cepheus, first place winner in the deep sky category at the Chiefland Fall Star Party 2010.AT10RC image of NGC 2244, an open cluster of young stars within the Rosette Nebula, by Brian Kimball, using an SBIG STL-11000 camera with Astrodon Gen II filters.
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Clear skies,
Astronomics


After many customer requests, we are proud to now offer the Astro-Tech AT10RC Ritchey-Chrétien astrograph, a Sky and Telescope Hot Product for 2010, with a premium low thermal expansion carbon fiber body. The AT10RC is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company, and is priced thousands of dollars less than competitive 10" RCs.





. . . our 34th year