Celestron 93635-A T-Adapter for NexStar 4GT

by Celestron

Product Details

• Product Dimensions: 2 x 1 x 2 inches ; 1 pounds
• Shipping Weight: 1 pounds (View shipping rates and policies)
• ASIN: B00009X3UW
• Item model number: 93635
• Average Customer Review: 3.2 out of 5 stars  See all reviews (5 customer reviews)
• Discontinued by manufacturer: Yes
• Date first available at Amazon.com: April 30, 2002

Product Description

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.

Customer Reviews

Most Helpful Customer Reviews

18 of 18 people found the following review helpful:

3.0 out of 5 stars Severe Vignetting for 35mm Full Frame Cameras, June 27, 2006

By 

Technology Guy - See all my reviews

This review is from: Celestron 93635-A T-Adapter for NexStar 4GT (Electronics)

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.

1 of 1 people found the following review helpful:

5.0 out of 5 stars Perfect. Better than expected, May 4, 2009

By 

Jeff® (cleveland, Ohio) - See all my reviews

Amazon Verified Purchase

This review is from: Celestron 93635-A T-Adapter for NexStar 4GT (Electronics)

I got this to mount my Sony á300 to my Celestron C-130 Mak. It is just perfect for prime focus. I expected it was going to be plastic like the crappy 45° visual back eyepiece holder Celestron supplied, but it is a very well made black anodized machined aluminum piece. The camera is mounted to the scope like a rock. (A big heavy rock LOL). For less than $25 and the second to none service from Adorama, you can't go wrong.

1 of 1 people found the following review helpful:

4.0 out of 5 stars Celestron T-adapter, December 12, 2008

By 

W. Dyer (Kalamazoo, MI United States) - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: Celestron 93635-A T-Adapter for NexStar 4GT (Electronics)

This T-adapter allows your film or digital SLR to attach to your telescope and take photographs. It is well constructed and easy to use. You will also need an adapter that fits on you camera, the two then link together. This adapter does not allow autofocus, but it didn't claim to do so. You focus via the focus device on your telescope.