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New Product Announcement: "Mister T" T Mount Adapter

Wa-chur-ed Observatory (that's me) is proud to announce our newest addition to the product family, MRT (Mister T).

MRT (Mister T) adapter for Canon DSLR astro-photography. With rock-solid mounting and easy camera rotation adjustment, I pity the fool that doesn’t use this adapter!

Click here for more information:

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Comment by Greg Marshall on March 19, 2013 at 4:26pm

The first batch of "Mister T" adapters is now ready. To order, please send me an e-mail including your zip code, so I can calculate shipping cost.


Comment by Greg Marshall on March 7, 2013 at 6:09pm

Russ, it's working for me. I have been seeing some unusual activity on the site and that might have restricted access. Let me know if you still have problems with it so I can contact my hosting service. Thanks!

Comment by Russ Ruggles on March 7, 2013 at 5:27pm

Greg. It appears your website is down. Let me know when it's back up and running.


Comment by Greg Marshall on March 6, 2013 at 12:23pm

You are right, low cost adapters often are looser than they should be, but even the best (standard) T mount adapters rely on springs to hold camera and optics together and a pin, which has to fit rather loosely, to prevent rotation. That's perfectly adequate for most camera lenses, but not for astro-photography.

Comment by Russ Ruggles on March 6, 2013 at 8:29am

Agreed. Having traveled down that path and seeing all the confusion from new imagers wanting to use this type of setup it only makes sense to offer full specs along these lines. I can't help but think about all the misinformation out there on various forums offered by well intentioned folks who had it wrong or simply misspoke.
The biggest issue I've found with the "low cost (quality) adapters is the lack of a positive lock which allows the adapter to rotate freely. I see your adapter as a solution to that problem.
Thanks for resonding so quickly.

Comment by Greg Marshall on March 6, 2013 at 7:47am

Thanks, Russ, I probably should include that specification for completeness, but it isn't really necessary. Here's why: The T mount system specifies a flange-to-image-plane distance of 55mm and the Canon EF mount has a 44mm distance, so to make a proper adapter, it must be 11mm thick to make up the difference. That's what it is, and most focal reducers are designed with that in mind, requiring a 55mm distance from their rear mounting surface to the image plane.

Comment by Russ Ruggles on March 6, 2013 at 4:47am

Greg - your ad on the above link doesn't mention the overall thickness of this adapter. Some of us like to use a focal reducer (6.3) on our SCT and optimal distance between the sensor and the FR is critical for maximum potential - plus or minus a couple of millimeters of course.


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