Celestron NexStar Evolution 925 9.25" f/10 wireless go-to SCT

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This NexStar Evolution 925 advanced 9¼" f/10 Schmidt-Cassegrain is the first go-to telescope (along with the other new NexStar Evolution scopes) with built-in WiFi so you are not tethered to your scope by a hand control on a coiled cord. You can slew to all of the best celestial objects with a simple tap on your smart phone or tablet. 

Simply connect your smart phone or tablet to your NexStar Evolution 925’s built-in wireless network, and you can explore the universe with Celestron's mobile app for iOS and Android. The app has a database of over 120,000 celestial objects for you to explore, including a specially selected list of 220 of the best deep sky and solar system objects that you will come back to enjoy again and again. 

You can use the app’s planetarium interface to view the night sky in real time or to display a list of the best celestial objects that are visible to you based on your time and location. You can then command your Evolution 925 to automatically slew to the object of your choice at speeds of up to four degrees per second, center it precisely in the eyepiece field, and then track it flawlessly while you observe and enjoy at your leisure. In addition, Celestron’s proprietary SkyAlign alignment procedure is built right into the Celestron mobile app, so you can have your scope set up and ready to observe within minutes. (If you don’t have a wireless device, or your smart phone or tablet runs out of juice in the field, a conventional hand control is included so you can still enjoy your scope.)

Celestron engineers designed the NexStar Evolution 925 based on years of customer feedback. It has an upgraded single fork arm design with many thoughtful features that combine to provide you with the best possible experience out under the stars. For example, forget about buying boxes of AA batteries to power the scope, or a bulky external battery pack. For the first time ever on a consumer telescope, the NexStar Evolution 925 includes its own built-in rechargeable lithium-ion battery. You can enjoy stargazing for up to 10 hours on a single charge, then recharge it at home using the supplied AC adapter. You can even use your NexStar Evolution 925’s built-in USB charge port to top off the other devices in your life that need to stay powered on during an observing session.

Large, ergonomic handles make setting up your NexStar Evolution 925 quick and painless. With a total weight of only 46.6 lbs, the Evolution 925 is easy to transport, whether it's out to the backyard for a quick half hour of observing or away on an all-night observing session at a distant dark sky site. The heavy duty adjustable height stainless steel tripod features lines etched on the legs to help you achieve a level, uniform height for your telescope without guesswork. 

Manual clutches in both altitude and azimuth give you the flexibility to manually point the telescope when it is powered off. You get two quality Plössl eyepieces to give you observing options right out of the box. If you expand your eyepiece collection, you can store up to seven eyepieces in the two accessory trays, one on the tripod and one on the telescope drive base. An adjustable brightness red LED in the fork arm casts a soft red glow onto the accessory tray in the base to make it easier to select a different eyepiece while observing.

If you’re interested in astroimaging, the 9¼” NexStar Evolution 925 is an affordable way to get started. It’s the only fork-mounted telescope in its price range that offers precision worm gears, along with improved motors, for precise speed control and low periodic error. With the NexStar Evolution 925’s good tracking accuracy, you can capture images of deep-sky objects like the Orion Nebula by simply attaching your DSLR camera. As you progress in the hobby of astroimaging, you can add an optional Celestron HD Pro wedge for longer exposures to bring out faint and hidden details in your astrophotos.

Celestron's time-tested 9¼" Schmidt-Cassegrain optics and industry-standard StarBright XLT optical coatings give you the bright, sharp views for which Celestron is famous. They make the Evolution 259 a great choice for visual observers and budding astroimagers alike.

The NexStar Evolution 925 includes built-in WiFi for cordless operation, a StarPointer red dot finderscope, two 1.25” Plössl eyepieces (59x and 180x), a 1.25” prism star diagonal, an AC adapter for powering the scope and recharging the built-in battery, a computer hand control, and a heavy duty stainless steel adjustable height tripod with accessory tray.
Highest Useful Magnification:
This is the highest visual power a telescope can achieve before the image becomes too dim for useful observing (generally at about 50x to 60x per inch of telescope aperture). However, this power is very often unreachable due to turbulence in our atmosphere that makes the image too blurry and unstable to see any detail.

On nights of less-than-perfect seeing, medium to low power planetary, binary star, and globular cluster observing (at 25x to 30x per inch of aperture or less) is usually more enjoyable than fruitlessly attempting to push a telescope's magnification to its theoretical limits. Very high powers are generally best reserved for planetary observations and binary star splitting.

Small aperture telescopes can usually use more power per inch of aperture on any given night than larger telescopes, as they look through a smaller column of air and see less of the turbulence in our atmosphere. While some observers use up to 100x per inch of refractor aperture on Mars and Jupiter, the actual number of minutes they spend observing at such powers is small in relation to the number of hours they spend waiting for the atmosphere to stabilize enough for them to use such very high powers.
Visual Limiting Magnitude:
This is the magnitude (or brightness) of the faintest star that can be seen with a telescope. The larger the number, the fainter the star that can be seen. An approximate formula for determining the visual limiting magnitude of a telescope is 7.5 + 5 log aperture (in cm).

This is the formula that we use with all of the telescopes we carry, so that our published specs will be consistent from aperture to aperture, from manufacturer to manufacturer. Some telescope makers may use other unspecified methods to determine the limiting magnitude, so their published figures may differ from ours.

Keep in mind that this formula does not take into account light loss within the scope, seeing conditions, the observer’s age (visual performance decreases as we get older), the telescope’s age (the reflectivity of telescope mirrors decreases as they get older), etc. The limiting magnitudes specified by manufacturers for their telescopes assume very dark skies, trained observers, and excellent atmospheric transparency – and are therefore rarely obtainable under average observing conditions. The photographic limiting magnitude is always greater than the visual (typically by two magnitudes).

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.

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.

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.

0.49 arc seconds
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.
The weight of this product.
46.6 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.
Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Terrestrial Observation:
Observing terrestrial objects (nature studies, birding, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial observing. Scopes with apertures under 5" to 6" are generally most useful for terrestrial observing due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes. 
Lunar Observation:
Visual observation of the Moon is possible with any telescope. Larger aperture scopes will provide more detail than smaller scopes, thereby getting a higher score in this category, but may require an eyepiece filter to cut down the greater glare from the Moon's sunlit surface so small details can be seen more easily. Lunar observing is more rewarding when the Moon is waxing or waning as the changing sun angle casts constantly varying shadows to reveal craters and surface features by the hundreds.  
Very Good
Planetary Observation:
Very Good
Binary and Star Cluster Observation:
Very Good
Galaxy and Nebula Observation:
Very Good
Terrestrial Photography:
Photographing terrestrial objects (wildlife, scenery, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial photography. Scopes with focal ratios of f/10 and faster and apertures under 5" to 6" are generally the most useful for terrestrial photography due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.
Lunar Photography:
Photography of the Moon is possible with virtually any telescope, using a 35mm camera, DSLR, or CCD-based webcam (planetary imager). While an equatorial mount with a motor drive is not strictly essential, as the exposure times will be very short, such a mount would be helpful to improve image sharpness, particularly with webcam-type cameras that take a series of exposures over time and stack them together. Reflectors may require a Barlow lens to let the camera reach focus. 
Planetary Photography:
Star Cluster / Nebula / Galaxy Photography:
2 years
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  • Starbright XLT multicoated 8” f/10 Schmidt-Cassegrain optics
  • Built-in wi-fi for smart phone and tablet control
  • Single fork arm design
  • Multicoated 1.25” 40mm (59x) and 13mm (180x) Plössl eyepieces
  • Star Pointer red dot non-magnifying finder
  • 1.25” star diagonal
  • 1.25” visual back
  • Dual axis worm gear DC drive (powered by built-in rechargeable battery)
  • NexStar SkyAlign go-to computer hand control 
  • Adjustable height all-metal heavy duty tripod with combined accessory tray/spreader bar
  • Dust covers
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Celestron NexStar Evolution 925 9.25" f/10 wireless go-to SCT

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Celestron NexStar Evolution 925 9.25" f/10 wireless go-to SCTAnother view of the Celestron NexStar Evolution 9 telescope.A different view of the Celestron NexStar Evolution 9 telescope.Close-up of the Celestron NexStar Evolution 9 metal spreader bar and eyepiece tray.Close-up of the Celestron NexStar Evolution 9 drive base handles and eyepiece tray.
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Our Product #: NXEV9
Manufacturer Product #: 12092
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Celestron’s new NexStar Evolution 925 9¼” f/10 go-to Schmidt-Cassegrain telescope brings big aperture amateur astronomy into the wireless 21st century of smart phones, iPads, and tablets. 

. . . our 36th year