WTB: 2" Visual back for SCT with 1.25" adaptor

yanyewkay · Post by **yanyewkay** » Wed May 09, 2007 10:23 am

The 2" visual back should have the compression ring to hold the diagonal or any accessory down really tight and firm.

Thanks!

kayheem · Post by **kayheem** » Wed May 09, 2007 11:21 am

I can loan you the T-adaptor with SCT threads to play with first, if you want. This will be really solid

yanyewkay · Post by **yanyewkay** » Wed May 09, 2007 11:33 am

wah so easy to guess what I wanna do huh? ahhah

anyway, thanks I've borrowed the t-ring for SCT already.

yanyewkay · Post by **yanyewkay** » Thu May 10, 2007 10:09 pm

still looking for the 2" visual back with compression rings.....

Post by **VinSnr** » Thu May 10, 2007 10:48 pm

yanyewkay wrote:still looking for the 2" visual back with compression rings.....

Why do you need this item? In the first place, most 2" visual back is for 10" SCT and above. I have not seen a 2" visual back for 8" SCT and below simply because the hole opening itself is less than 2".

Even if you can find this, this item will not be secure enough to clamp a 2" diagonal and a DSLR camera. Furthermore, you have a 2" eyepiece also.

What you should get is a 2" SCT diagonal with SCT thread to screw onto the 6" SCT back. This will be dead firm because it's a screw-on. If you want to do prime focus, get a T-adaptor, screw onto the back of the SCT and then mount a T-ring on the T-adaptor

SCT <-- T-adaptor <-- Canon EOS T-ring <-- DSLR camera

OR if you want to use the 2" eyepiece

SCT <-- 2" SCT diagonal <---2" eyepiece <--- DSLR camera

Forget about that 2" visual back.

Post by **acc** » Thu May 10, 2007 10:54 pm

Hmm I have used a 2" visual back with an 8" SCT without problems leh... The advantage is that you dont have to go buy a 2" SCT diagonal if you already have a standard 2" diag.

jermng · Post by **jermng** » Thu May 10, 2007 11:31 pm

I'm also currently using a 2" VB with my 8" SCT. Like what's been said, I can use all the 2" accesories I currently have.

Post by **VinSnr** » Thu May 10, 2007 11:34 pm

acc wrote:Hmm I have used a 2" visual back with an 8" SCT without problems leh... The advantage is that you dont have to go buy a 2" SCT diagonal if you already have a standard 2" diag.

I doubt that visual back can hold a 2" diagonal, a 2" eyepiece, a Canon DSLR plus the camera holder. Especially considering the shape of the DSLR. During movement of the mount, I am sure the diagonal will slip no matter how strong you clamp the diagonal using that one small screw on the compression ring

Why want to take the risk epsecially when you have a DSLR there?

Post by **acc** » Thu May 10, 2007 11:40 pm

Oh wow that's quite a load... I was thinking of 2" diagonal and 2" beer-can sized eyepieces only...

Better be careful then.

Post by **weixing** » Fri May 11, 2007 12:15 am

Hi,

SCT <-- 2" SCT diagonal <---2" eyepiece <--- DSLR camera

IMHO, you don't need a 2" diagonal even you do eyepiece projection. The 2" diagonal will just add more aberration to your image.

For prime focus:
SCT <-- SCT to 1.25"/2" adapter <-- 1.25"/2" T-Adapter <-- T-Ring <-- DSLR
or
SCT <-- SCT to T-Thread <-- T-Ring <-- DSLR

For eyepiece projection:
SCT <-- SCT to 1.25"/2" adapter <-- 1.25"/2" T-Adapter <-- 1.25"/2" Eyepiece Projection Adapter with eyepiece <-- DSLR

Anyway, ScopeStuff do sell them ( http://www.scopestuff.com/ss_adt2.htm ) or you can ask Astro Bargains to get it for you.

Have a nice day.