Barlow, DSLR and ED80 - can't find focus

[niko]

Hi all,

the other night I attempted to connect my DSLR to the ED80 with the barlow in the imaging train.

I couldn't find focus and wonder if I need to shortern or lengthen the image train to achieve it.

I currently have DSLR, T-ring, t-ring to 2" tube and 2" extension tube. I connected the barlow after all this and before the scope.

Any help greatly appreciated

many thanks

niko

[pluto (Hugh)]

I had the same problem, I bought a 2" 50mm extention tube and now I can get focus.
I could see the image getting sharper the further I out I moved the focuser so I knew I needed the camera to be further away. I have an ED80 and a 5DmkII.

[niko]

thanks Hugh. I already have the extension tube in the set-up so I wonder if I need a longer one or another one...?

[Larryp (Laurie)]

Hi Niko
I have an NG 102 triplet, and I can just get focus with a 50mm extension tube with the focus racked right out, so I run it with a 50mm extension and a 35 mm extension together. Thats with a 4x Powermate with the extension tubes between the Powermate and the focuser.

[niko]

thanks Laurie

so it would go

camera, t-ring, barlow, extension tubes, focusser...?

[pluto (Hugh)]

My setup is-
T-ring to one of these:
http://www.bintel.com.au/Astrophotog...oductview.aspx
then a 50mm spacer like this:
http://www.bintel.com.au/Accessories...oductview.aspx
then the barlow into the focuser (I think, I haven't used it in a while, I may have the extention tube after the barlow but I can't remember).

[Larryp (Laurie)]

Originally Posted by niko

thanks Laurie

so it would go

camera, t-ring, barlow, extension tubes, focusser...?

Yes, Niko

[jjjnettie (Jeanette)]

LOL I slotted in the 4x powermate into my RC8 last night. My total image train was over 12" LOL It looked ridiculous, but it worked and was still reasonably sturdy.

[Larryp (Laurie)]

Originally Posted by jjjnettie

LOL I slotted in the 4x powermate into my RC8 last night. My total image train was over 12" LOL It looked ridiculous, but it worked and was still reasonably sturdy.

My imaging train looks just as ridiculous