Celestron 93635-A T-Adapter for NexStar 4GT
by Celestron
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Category: Digital Camera
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Digital Photo Product Details
Manufacturer: CelestronModel: 93635
Product features:
- Allows attachment of your 35mm SLR camera to your telescope or spotting scope
- Compatible with NexStar 4 and for all C90 Spotting Scopes
- Excellent for terrestrial photography
- Great for short exposure lunar and planetary photography
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Digital Cameras Photo Reviews of Celestron 93635-A T-Adapter for NexStar 4GT
Customer Review: Severe Vignetting for 35mm Full Frame Cameras
Summary: 3 Stars
The Celestron 93635-A T-Adapter connects the rear cell of a NexStar 4 or C90 scope to a T-ring (sold seperately) which is designed to fit your specific camera. There isn't much to the adapter -- just a threaded metal tube with a metal screw-on ring on one end. Note that you will need to use your camera in fully manual mode though the camera's internal light meter will probably function normally allowing you to set the shutter speed for a proper exposure during daylight hours.
While the T-Adapter does function as advertised, it suffers from a design flaw -- the connecting tube is too narrow causing severe vignetting (i.e., the corners of phtots are cut off and appear very dark or black) at least for a 35mm full frame camera mounted to a C90. I have not tried it with a C-sized digital camera yet. Due to the severity of vignetting, you might want to consider an alternative model of T-Adapter or, better yet, a Tele-Extender designed for Schmidt-Cassegrain telescopes such as the Orion 1.25" Standard Tele-Extender which can be used in place of a T-adapter on the C90, doesn't suffer from these sever vignetting problems and is much more versatile.
Note: A tele-extender is similar to the T-adapter but is designed to optionally allow you to place a telescope eyepiece inside - between the scope and the camera - for even higher magnification. For example, with the T-adapter, a C90 can function as a 1200mm manual camera lens. With a tele-extender, it can do the same or, by adding a 18mm eyepiece, act as a 5000mm or greater lens.
Description of Celestron 93635-A T-Adapter for NexStar 4GT
A T-Adapter allows you to attach your 35mm SLR camera to the prime focus of your telescope or spotting scope. This arrangement is used for terrestrial photography and short exposure lunar and planetary photography. It can also be used for long exposure deep-sky photography when using a separate guidescope.Both a T-Adapter and T-Ring are required to mount a camera to your instrument.Telescope Accessories
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