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Main
Date: 13 Jul 2007 12:03:18
From: actuary@mchsi.com
Subject: T-Ring Question
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To: All
I recently purchased a Canon Digital Rebel XT. I'm considering to do
some prime focus astrophotography with my Celetron 8. The Celetron 8
is about 30 years old.
My question is: Is there a different T-Ring for the Canon Digital
Rebel SLR camera and the film version Canon Rebel or will the same T-
Ring work. I have to a buy a T-ring and I don't want to buy the wrong
one.
Larry
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Date: 14 Jul 2007 05:15:41
From: actuary@mchsi.com
Subject: Re: T-Ring Question
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On Jul 13, 8:32 pm, canopus56 <canopu...@yahoo.com > wrote:
> On Jul 13, 5:49 pm, "actu...@mchsi.com" <actu...@mchsi.com> wrote:
> <snip all>
>
> Some direct references:
>
> T-Canon EOS Adapterhttp://www.telescopes.com/products/celestron-t-ring-canon-eos-6046.html
>
> T-Canon EOS Adapter (#TTCE)http://www.scopestuff.com/ss_tadpt.htm
>
> T-to SCT Adapter (#TASL)http://www.scopestuff.com/ss_tadpt.htm
>
> Universal T-1/4 adapterhttp://www.telescopes.com/products/celestron-t-adapter-universal-1-14...
>
> Canon EOS to 2" Barrel Adapterhttp://www.scopestuff.com/ss_b2ce.htm
>
> - Canopus56
Canopus56
Thanks. I made my purchase.
Larry
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Date: 14 Jul 2007 05:14:59
From: actuary@mchsi.com
Subject: Re: T-Ring Question
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On Jul 13, 6:56 pm, Chris L Peterson <c...@alumni.caltech.edu > wrote:
> On Fri, 13 Jul 2007 16:49:45 -0700, "actu...@mchsi.com"
>
> <actu...@mchsi.com> wrote:
> >I think that we are on the same page. Your "EOS to T-Adapter" is what
> >I am calling the T-Ring (item on left in the first image) and that
> >this part is camera specific.Your SCT to T-adapter" i(item on right in
> >first image) s what I called the T-adapter and this isn't camera
> >specificbut must be able to attach to the telescope at one end and the
> >"T-ring" at the other end.
>
> You got it.
>
> _________________________________________________
>
> Chris L Peterson
> Cloudbait Observatoryhttp://www.cloudbait.com
Chris:
I "got it" because you helped.
Larry
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Date: 13 Jul 2007 18:32:10
From: canopus56
Subject: Re: T-Ring Question
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On Jul 13, 5:49 pm, "actu...@mchsi.com" <actu...@mchsi.com > wrote:
<snip all >
Some direct references:
T-Canon EOS Adapter
http://www.telescopes.com/products/celestron-t-ring-canon-eos-6046.html
T-Canon EOS Adapter (#TTCE)
http://www.scopestuff.com/ss_tadpt.htm
T-to SCT Adapter (#TASL)
http://www.scopestuff.com/ss_tadpt.htm
Universal T-1/4 adapter
http://www.telescopes.com/products/celestron-t-adapter-universal-1-14-inch-11515.html
Canon EOS to 2" Barrel Adapter
http://www.scopestuff.com/ss_b2ce.htm
- Canopus56
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Date: 13 Jul 2007 16:49:45
From: actuary@mchsi.com
Subject: Re: T-Ring Question
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On Jul 13, 6:39 pm, Chris L Peterson <c...@alumni.caltech.edu > wrote:
> On Fri, 13 Jul 2007 13:30:55 -0700, "actu...@mchsi.com"
>
> <actu...@mchsi.com> wrote:
> >Chris:
>
> >To be perfectly clear, I understand that the T-Ring must be Can EOS
> >specific. The T-ring attaches to the camera. The adapter attaches to
> >the back end of the telescope and the T-ring. My first thought was
> >that a T-adapter was a T-adaptor and not dependent on the camera type
> >since it doesn't connect directly to the camera.
>
> >Based on the last sentence in your original response, my think may be
> >wrong. Please advise.
>
> Hi Larry-
>
> The T-ring system is a standardized adapter design. It basically
> specifies a threaded connection. By using a device-specific adapter at
> each end (that is, the telescope and the camera) it is possible to use
> standardized connectors, spacers, etc between them.
>
> The part you are actually looking for is an adapter from an EOS bayonet
> to a T-thread. Once you have that, there are several options for
> connecting the camera to the telescope. One method is to use a
> T-threaded 1.25" or 2" adapter that you can place directly into the
> eyepiece holder. I don't care for that approach since there's often
> play, the camera focal plane may not be perpendicular to the optical
> axis, and it's easy for the camera to fall out. What I use is two T-ring
> components: an EOS-to-T adapter for my camera, and an SCT-to-T adapter
> for my scope. The latter has SCT threads on one side, and ends in a
> short tube with T-threads on the other. That screws into the camera
> adapter, and provides a solidly threaded mounting system.
>
> Here are a couple of images of what the components look like:http://www.cloudbait.com/misc/t1.jpghttp://www.cloudbait.com/misc/t2.jpg
>
> _________________________________________________
>
> Chris L Peterson
> Cloudbait Observatoryhttp://www.cloudbait.com
Chris:
I think that we are on the same page. Your "EOS to T-Adapter" is what
I am calling the T-Ring (item on left in the first image) and that
this part is camera specific.Your SCT to T-adapter" i(item on right in
first image) s what I called the T-adapter and this isn't camera
specificbut must be able to attach to the telescope at one end and the
"T-ring" at the other end.
Larry
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Date: 13 Jul 2007 23:56:52
From: Chris L Peterson
Subject: Re: T-Ring Question
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On Fri, 13 Jul 2007 16:49:45 -0700, "actuary@mchsi.com"
<actuary@mchsi.com > wrote:
>I think that we are on the same page. Your "EOS to T-Adapter" is what
>I am calling the T-Ring (item on left in the first image) and that
>this part is camera specific.Your SCT to T-adapter" i(item on right in
>first image) s what I called the T-adapter and this isn't camera
>specificbut must be able to attach to the telescope at one end and the
>"T-ring" at the other end.
You got it.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 13 Jul 2007 13:30:55
From: actuary@mchsi.com
Subject: Re: T-Ring Question
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On Jul 13, 3:07 pm, Chris L Peterson <c...@alumni.caltech.edu > wrote:
> On Fri, 13 Jul 2007 12:03:18 -0700, "actu...@mchsi.com"
>
> <actu...@mchsi.com> wrote:
> >My question is: Is there a different T-Ring for the Canon Digital
> >Rebel SLR camera and the film version Canon Rebel or will the same T-
> >Ring work. I have to a buy a T-ring and I don't want to buy the wrong
> >one.
>
> They are both the basic EOS bayonet. The adapter is the same for both
> the film and digital Rebels. Just make sure that "EOS" is specified,
> since there are adapters for older style Canon mounts as well.
>
> _________________________________________________
>
> Chris L Peterson
> Cloudbait Observatoryhttp://www.cloudbait.com
Chris:
To be perfectly clear, I understand that the T-Ring must be Can EOS
specific. The T-ring attaches to the camera. The adapter attaches to
the back end of the telescope and the T-ring. My first thought was
that a T-adapter was a T-adaptor and not dependent on the camera type
since it doesn't connect directly to the camera.
Based on the last sentence in your original response, my think may be
wrong. Please advise.
Thanks.
Larry
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Date: 13 Jul 2007 23:39:23
From: Chris L Peterson
Subject: Re: T-Ring Question
|
On Fri, 13 Jul 2007 13:30:55 -0700, "actuary@mchsi.com"
<actuary@mchsi.com > wrote:
>Chris:
>
>To be perfectly clear, I understand that the T-Ring must be Can EOS
>specific. The T-ring attaches to the camera. The adapter attaches to
>the back end of the telescope and the T-ring. My first thought was
>that a T-adapter was a T-adaptor and not dependent on the camera type
>since it doesn't connect directly to the camera.
>
>Based on the last sentence in your original response, my think may be
>wrong. Please advise.
Hi Larry-
The T-ring system is a standardized adapter design. It basically
specifies a threaded connection. By using a device-specific adapter at
each end (that is, the telescope and the camera) it is possible to use
standardized connectors, spacers, etc between them.
The part you are actually looking for is an adapter from an EOS bayonet
to a T-thread. Once you have that, there are several options for
connecting the camera to the telescope. One method is to use a
T-threaded 1.25" or 2" adapter that you can place directly into the
eyepiece holder. I don't care for that approach since there's often
play, the camera focal plane may not be perpendicular to the optical
axis, and it's easy for the camera to fall out. What I use is two T-ring
components: an EOS-to-T adapter for my camera, and an SCT-to-T adapter
for my scope. The latter has SCT threads on one side, and ends in a
short tube with T-threads on the other. That screws into the camera
adapter, and provides a solidly threaded mounting system.
Here are a couple of images of what the components look like:
http://www.cloudbait.com/misc/t1.jpg
http://www.cloudbait.com/misc/t2.jpg
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 13 Jul 2007 13:14:12
From: actuary@mchsi.com
Subject: Re: T-Ring Question
|
On Jul 13, 3:09 pm, Sam Wormley <sworml...@mchsi.com > wrote:
> actu...@mchsi.com wrote:
> > To: All
>
> > I recently purchased a Canon Digital Rebel XT. I'm considering to do
> > some prime focus astrophotography with my Celetron 8. The Celetron 8
> > is about 30 years old.
>
> > My question is: Is there a different T-Ring for the Canon Digital
> > Rebel SLR camera and the film version Canon Rebel or will the same T-
> > Ring work. I have to a buy a T-ring and I don't want to buy the wrong
> > one.
>
> > Larry
>
> They are both EOS, the mount will be the same.
> http://www.usa.canon.com/consumer/controller?act=ProductCatIndexAct&f...
Sam and Chris:
Thanks for exactly the information I needed.
Larry
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Date: 13 Jul 2007 20:09:20
From: Sam Wormley
Subject: Re: T-Ring Question
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actuary@mchsi.com wrote:
> To: All
>
> I recently purchased a Canon Digital Rebel XT. I'm considering to do
> some prime focus astrophotography with my Celetron 8. The Celetron 8
> is about 30 years old.
>
> My question is: Is there a different T-Ring for the Canon Digital
> Rebel SLR camera and the film version Canon Rebel or will the same T-
> Ring work. I have to a buy a T-ring and I don't want to buy the wrong
> one.
>
> Larry
>
They are both EOS, the mount will be the same.
http://www.usa.canon.com/consumer/controller?act=ProductCatIndexAct&fcategoryid=111
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Date: 13 Jul 2007 20:07:51
From: Chris L Peterson
Subject: Re: T-Ring Question
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On Fri, 13 Jul 2007 12:03:18 -0700, "actuary@mchsi.com"
<actuary@mchsi.com > wrote:
>My question is: Is there a different T-Ring for the Canon Digital
>Rebel SLR camera and the film version Canon Rebel or will the same T-
>Ring work. I have to a buy a T-ring and I don't want to buy the wrong
>one.
They are both the basic EOS bayonet. The adapter is the same for both
the film and digital Rebels. Just make sure that "EOS" is specified,
since there are adapters for older style Canon mounts as well.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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