Connecting a 400d at prime focus to 80ED - CONFUSED.

[beamer3.6m]

I have just purchased a C80ED and would like to attach my 400d directly to it.

The scope has a 1.25" direct SLR adapter on the focuser but I would like to attach it to the 2" focuser instead.

What do I need to do this?

Also, will I need any other bits'bobs etc to get focus.

CONFUSED.

[beamer3.6m]

Would I be right in thinking it is one of these:

http://www.firstlightoptics.com/proddetail.php?prod=ae2inchadapter

and if so could I use the one which came with my Explorer 200 Crayford focuser.

[Roy Batty]

Beamer,

Yep that will do the job if you've already got a T-ring, otherwise this will also do the job as an all in one...

http://www.firstlightoptics.com/proddetail.php?prod=max_dslr_camera_adaptor

[steppenwolf]

The 2" adapter you have would work fine BUT as you will have removed the diagonal, the light path may well be too short so you may need an extension tube to make up the difference in length.

[beamer3.6m]

Thanks Roy.

I will try out the one which came with my Explorer 200 and upgrade to the MAX if not.

[beamer3.6m]

Is any length of extension needed or is it specific.

Also, do you have a link to such an item at FLO.

[Roy Batty]

You might be OK getting focus without any extension tubes, I don't need any on my SW ED80 - which is broadly similar to the Celestron 80ED.

Keith

[russ]

Beamer, here's a link to the extension tubes:

http://firstlightoptics.com/proddetail.php?prod=focusextender

Quite a cheap purchase. I never needed any extension for my ED80 btw when using the 350D at prime focus. So give it go without extension first.

Russ

[steppenwolf]

When I said that the one you have would be fine, I meant the one you have pointed a link to!

As I suggested, you may not need an extension at all but the way to find out it to point the 'scope at a distant object with the tube racked fully out and bring the camera body up behind it in line with the focus tube and attached 2" throat and see if you can achieve focus. If you hit the 2" throat on the focus tube before you achieve focus then you won't need an extension tube.

[George]

The 2" adapter you have would work fine BUT as you will have removed the diagonal, the light path may well be too short so you may need an extension tube to make up the difference in length.

You will need an extension tube if you remove the diagonal.

[Ant]

The 2" adapter you have would work fine BUT as you will have removed the diagonal, the light path may well be too short so you may need an extension tube to make up the difference in length.

You will need an extension tube if you remove the diagonal.

Agreed completely... I have a 300D and an ED80 and use the diagonal as the extension tube.

Ant

[beamer3.6m]

So if you use the diagonal as the extension tube do you use a 2" diagonal or 1.25" and what is better - I assume the 2".

[Psychobilly]

A bigger diagonal or adaptor will produce less vignetting...

[Merlin66]

A 2" long extention tube will replace the diagonal and give better images. A small investment in this business!!!