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Old 02-12-2012, 08:29 PM
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T-Ring for Canon EOS Camera?

I have met a photographer who is interested in connecting his camera bodies onto my Newtonian Reflector for some prime focus photography. I do not have any expierence with prime focus and need a little assistance.
  • I have a Sky Watcher 12" GoTo Newtonian Dob with the standard Crayford style focuser.
  • He has two Canon cameras, a 5d Mkii full frame and a 1D Mk iv
Is the following Canon T-Ring from Bintel going to be suitable for connecting both camera bodies to the focuser of my OTA?

www.bintel.com.au/Astrophotography/Adapters/Canon-EOS-T-Ring/36/productview.aspx

Thank you.
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Old 02-12-2012, 08:33 PM
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pluto (Hugh)
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Yep that's what you need, plus you need one of these to screw into the T-ring which then slots into the focuser. http://www.bintel.com.au/Astrophotog...oductview.aspx

EDIT: I don't know about Newts, you may need an extra/longer extention tube to be able to get focus
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Old 02-12-2012, 08:33 PM
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Octane (Humayun)
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Yep, that's all you need to connect the camera to the focuser.

Not sure if it'll come to focus, though...

H
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Old 02-12-2012, 08:33 PM
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Octane (Humayun)
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Plus what Hugh said!

H
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Old 02-12-2012, 08:57 PM
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With that adaptor you will get vignetting with the full frame sensor.

You need a wide T Mount adaptor if you don't want vignetting around the edge of you photos.

Takahashi make a good one for the Canon. I ordered one from OPT a couple of weeks ago. Fairly expensive, about $100 for the adaptor + shipping.

It works well and has eliminated the vignetting that the normal sized T Mount caused.

Here is an example of the vignetting.


Cheers

Phil
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Last edited by CDKPhil; 02-12-2012 at 09:07 PM.
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Old 02-12-2012, 09:05 PM
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Thanks Hugh and Humayun,

It looks like I am on the slippery slope that is Astro Photography...even if it is with another photographers equipment. The learning curve looks steep.

My 12" Newtonian scope is a Flex Tube model. www.bintel.com.au/Telescopes/Dobsonian/SkyWatcher-14--Synscan-GOTO-Dobsonian/767/productview.aspx

Will this allow focus to be achieved more easily if the OTA is shortened a little?
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Old 02-12-2012, 09:28 PM
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Quote:
Originally Posted by CDKPhil View Post
With that adaptor you will get vignetting with the full frame sensor.

You need a wide T Mount adaptor if you don't want vignetting around the edge of you photos.

Takahashi make a good one for the Canon. I ordered one from OPT a couple of weeks ago. Fairly expensive, about $100 for the adaptor + shipping.

It works well and has eliminated the vignetting that the normal sized T Mount caused.

Here is an example of the vignetting.


Cheers

Phil
Thank you Phil. I will pass this information on. Thanks for taking the time to post an example of the vignetting. Very helpful.
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Old 02-12-2012, 09:46 PM
Forgey (Paula)
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Quote:
Originally Posted by Shark Bait View Post
Thanks Hugh and Humayun,

It looks like I am on the slippery slope that is Astro Photography...even if it is with another photographers equipment. The learning curve looks steep.

My 12" Newtonian scope is a Flex Tube model. www.bintel.com.au/Telescopes/Dobsonian/SkyWatcher-14--Synscan-GOTO-Dobsonian/767/productview.aspx

Will this allow focus to be achieved more easily if the OTA is shortened a little?
Yep you should be able to achieve focus you'll just have to play around with it a little.
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Old 02-12-2012, 09:55 PM
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Yep, you can definitely attach a Canon DSLR to the FlexTube dobs. On my 10" model, I just have to retract the secondary mirror a few centimeters (ie don't extend the secondary all the way until the lock position) for prime focus. The coma's pretty bad on a full frame chip, though.

If you use a barlow/extender, I think you may be able to reach focus with the secondary in the normal visual position.
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Old 03-12-2012, 07:34 AM
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Thanks for your advice Paula and Dave.
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