Astro-Tech 60mm photoguide refractor

$139.95

Availability: More on the way

The new Astro-Tech AT60GS 60mm guidescope with upgraded helical focuser makes highly accurate autoguiding of deep space astrophotos affordable for any astrophotographer. 
Our Product #: AT60GS
Astro-Tech Product #: AT60GS
 

Product Description

The new Astro-Tech AT60GS 60mm fast focal ratio guidescope adds 10mm of aperture to its 50mm predecessor to allow guiding on fainter stars . . . plus a new rock-solid upgraded helical focuser to eliminate any possible play in the focuser over its entire travel range.
 
The Astro-Tech AT60GS guidescope refractor  is superb for guiding long-exposure DSLR and CCD astrophotos. It is usable with refractors and imaging Newtonians up to 1500mm in focal length, as well as longer focal length scopes, such as the 12" Astro-Tech Ritchey-Chrétien astrographs.
 
Taking deep space photos used to require tedious and error-prone manual guiding through a crosshair eyepiece and a large aperture, long focal length guidescope. However, the guiding accuracy of modern CCD autoguiders allows hands-free automatic guiding of long exposure photos through smaller guidescopes with much shorter focal lengths. Using an optically "fast" guidescope, such as the 60mm Astro-Tech AT60GS, you save valuable time, space, and money, while still recording the pin-point star images that only autoguiding can bring to long-exposure astrophotos.
  
How well does an Astro-Tech guidescope perform as a guider? See for yourself. The feature image above of the Horsehead Nebula in H-alpha was taken using the original smaller 50mm Astro-Tech guidescope by Dennis Wigley, John Dutton, and Kevin Davis. It used Dennis and Kevin's 80mm f/7 Astro-Tech apo refractor and John's mono Orion G3 camera. Dennis supplied the Meade LXD55 mount, Meade DSI pro guider, Orion 1.25" H-alpha filter, and the Astro-Tech 50mm guidescope. The 50mm Astro-Tech guided for nine 15 minute exposures and one 10 minute exposure - a total of 145 minutes of guiding. We invite you to check the roundness of the stars in the highly enlarged image above to see just how accurately an Astro-Tech guidescope can guide. 

The Astro-Tech AT60GS guidescope is a 60mm aperture 240mm focal length (f/4) achromatic refractor with a two-part helical focuser. It has dual mounting rings with nylon-tipped collimation screws (three per ring). The rings are attached to a dovetail mounting bar. Add an optional small-chip CCD autoguider (such as the Celestron NexGuide), and you ready for automatic guiding.
 
The guidescope has a 1.23" (31mm) wide by 3.5" (89mm) long dovetail mounting bar. This fits into the dovetail finder base found on most Astro-Tech telescopes and many other scopes from other manufacturers. If your imaging scope doesn't feature a dovetail base or has one already occupied by a finder, the included dovetail bar has predrilled holes that let you attach the Astro-Tech guidescope to almost any optical tube. It can mount in the alternate finderscope location at the 1:00 o'clock position on the rear cell of most Schmidt-Cassegrain scopes. It can also mount on one of the tube rings holding a refractor or reflector optical tube (which are usually drilled and tapped to hold just such an accessory).
 
The Astro-Tech AT60GS guidescope weighs only 26 ounces (33 ounces with the mounting rings and dovetail mounting bar). Its light weight lets you replace a heavier guidescope to gain a little breathing room with imaging setups that are pushing your mount's payload capacity. It measures 10.2" (259mm) long with the focuser collapsed. With the focuser fully extended it measures 12" (305mm) long. A 48mm long fixed dew shield (with metal dust cover) shields the fully multicoated cemented doublet lens from stray light.

The  Astro-Tech  guidescope's helical focuser has a fixed-orientation design that does not rotate your CCD autoguider during focusing. The helical focuser simply moves the attached autoguider in or out while maintaining its set orientation. This ensures that the field of potential guide stars will not rotate when focusing.
  
The focuser has two parts. The first is a drawtube with 36mm of travel slides in and out of the guidescope's body to provide a rough focus. The tube has a scale marked in 1mm increments so you can return to the correct extension distance whenever needed. A thumbscrew holds the drawtube in position.
 
The second part is the newly engineered helical focusing mechanism itself. This has a knurled focusing collar and adds another 10mm of travel for fine tuning the focus. A 0-10 scale on the drawtube has sub-markings that show each 1/10th mm of drawtube extension. A thumbscrew holds the helical drawtube in position. The new helical focuser design eliminates any possible play or wiggle in the focuser drawtube over its entire travel range.
 
The focuser terminates in a 1.25" accessory holder for those guiders that have a fixed 1.25" nose piece for connecting guider to guidescope. There are also male T-threads for a more solid and secure direct attachment of a guider whose nose piece can be removed to expose female T-threads for attachment to a guidescope.
     
When not being used for autoguiding, the Astro-Tech 60mm can be used as a finder scope. Just insert an optional Astro-Tech 24mm illuminated reticle eyepiece (#AT24IL) into the focuser and the versatile 60mm Astro-Tech guidescope turns into a 10x60mm straight-through illuminated crosshair finder with a 5° field of view and a long 20mm eye relief.

Tech Details

Weight 27 oz.
Warranty 1 year

Reviews

Review by:
This scope has been my primary guide scope using PHD2 for almost a year. The focuser took a little getting used to and unless you're careful it can work loose. No complaints about the mounting rings or optics. Overall a great value and I would purchase again. (Posted on 9/3/2019)
Review by:
I use this guide scope with a ZWO 290mm mini. PHD2 saw everything, was able to see very faint stars and guide my iOptron ZEQ25 for 2 minute subs. I will next use this to guide a Skywatcher EQ6e-Pro.
The scope with the mono imager has nice round stars, and a focuser thank makes it easy to bring the stars to points. (Posted on 7/22/2019)
Review by:
Had it mounted over/under with a WO Star 71. Camera was a QHY5LII-M with a t-thread to C mount adapter. Once focused it stayed focused through multiple tear downs and transports in my portable imaging system - just plug and play. I had it mounted with 3" rings and felt, I've never liked those Delrin tipped thingy rings - only reason it didn't get 5 stars. Sell it for slightly less without the rings and it would have been perfect. (Posted on 7/22/2019)
Review by:
I bought this to replace a smaller (50 mm) guidescope I use with my Meade 8" SCT on a CGEM. The best feature is the focuser, which I have used with two different cameras and used the settings to repeat a pretty good focus when switching. Optical quality is very good. The dovetail is my least favorite feature - it would be nice to actually see someone come up with a standard for finder/guidescopes. Overall, very much worth the reasonable price. (Posted on 1/7/2019)
Review by:
When you’re ready to take AP to the next level a guide scope and camera are the ticket to much longer sub frames. This 60mm guide scope is the perfect size for wide range of image scale on your primary imaging system, from small 80mm APOs to much longer focal length reflectors thi guide scope handles the job. pair with something like a ZWO ASI120mm mini for a guide camera n only your mount will limit how long your subs can be. Irks amazing well with PHD2 guide s/w. (Posted on 1/5/2019)
Review by:
I bought this from Astronomics to guide with a ASI174MC on my AT115EDT and/or my C8 on a Celestron CGEM mount. When I first took it out I was not expecting much since this is similar to other guidescopes on Amazon. Instead I received a very wide angle and the focuser made it very easy to fine tune so I had very sharp stars. Much easier than expected. I love being able to rotate my camera without impacting the focus and vice versa. The rings that come with it are good with nylon tips to prevent marring and large enough to allow for a range adjustments. Would have preferred a different dovetail, but that is just my rig and preference. An excellent value. (Posted on 1/1/2019)
Review by:
I use this guide scope with my AT 115EDT and with a DSLR and photographic lenses. Paired with a ZWO ASI120-MM and PhD2 guiding is excellent. The eyepiece holder unscrews allowing the ASI120-MM to be screwed on to the AT60GS 60mm guide scope to help reduce flexure. (Posted on 12/26/2018)
Review by:
Bought the AT 60gs to round out my AT-115 EDT/CGX AP setup. I use it as a finder scope and a guide scope. My ZWO 120mc works great with this guides scope. Very pleased with my purchase! (Posted on 11/2/2018)
Review by:
I use this guide scope with a QHY-5L-II camera on my Skywatcher 120 Pro ED refractor. Guiding is excellent and I get pinpoint stars with my Celestron Nightscape 8300 camera. I'm really hppy with the performance and price of this guide scope. (Posted on 10/17/2018)
Review by:
I have this guidescope and love it. I have never had any play in the focuser or draw tube. My lights (photos) show pin point stars over 1min exposures. I use mine mounted on a dove tail, centered atop my scope rings. I do not advise using a finder scope base, as flexure will be inevitable. The optics are very sharp, and it actually produces fairly amazing photos of the big stuff; i.e. Andromeda and larger. This scope is a steal at this price. (Posted on 10/7/2018)
Review by:
I am not a fan of helical focusers but found this scopes focuser to be accurate and smooth.
There are similar products with greater precision and much greater price tags. Point for point this is the best photo guider at this price, hands down. (Posted on 10/7/2018)
Review by:
There are no competitors in the market that can match the quality and performance at this price.
I have never been a helical focuser fan but this scope has a smooth accurate focuser. Sure there are upper-end products with closer tolerances and crazy prices but on a fair comparison this guide scope performs with the best of them and didn't empty my bank account. (Posted on 10/7/2018)
Review by:
High quality optics for use as an autoguider. No wiggle or play in this 60mm version. Alignment to main scope is precise with the ring system. 240mm focal length f4 optics provide a wide bright sharp field of view.

Fit and finish looks great on my Explore Scientific 127 ED APO. (Posted on 8/4/2017)
Review by:
Excellent guide scope.
I use it with a QHY5-II camera, and guiding is excellent. (Posted on 8/4/2017)
Review by:
I like everything about it except that the helical focuser has some wiggle in it. The optics and rings are good but to use the scope as a guidescope I don't feel comfortable focusing with the helical focuser due to the wiggle. It won't wiggle if you crank the helical focuser all the way in or out which is what I do. Of course you then have to rely on the other focusing mechanism which is just sliding the focus tube in and out. I was told this was normal so I think you'll have to spend more $$ for a similar scope with no play in the helical focuser (Stellarvue or Borg perhaps). (Posted on 8/4/2017)
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