Focus issue with 80ED and 1000D dslr.

[simon84]

Was out and about last night, managed to get the mount polar aligned and tracking beautifully.

So thought I would have a go at just getting some stars, keep it simple I thought.

I was using my 80ED with my EOS 1000D with an LP filter.

I was struggling to see anything through the view finder or with live view so took a 30 second image with the focuser all the way in and then a series of images until the focuser was all the way out.

Here is what I got, to me it looks like I need more back focus but could someone in the know just confirm that for me?

Cheers.

[SteveL]

Most refrators require some additional spacer tubes to get cameras to focus, its quite normal.

[simon84]

I thought it might be the case but I was desperatley running out of time last night. I'd chosen Arcturus, which ended being one of the last stars to dissapear before all the clouds came rolling in.

I thought I might be ok as the Equinox has a lot of travel but I have a couple of 50mm adapters which I will try on the next outing.

Thanks for the quick reply Steve, cant wait to move over to ccd imaging.

[George]

50mm is whats needed with the ED80 & the 1000D

Adaptors - Two-inch Focus Extension tubes

[steppenwolf]

50mm will be fine:_

[simon84]

Excellent, thanks for the picture Steve.

With the clouds rolling in I ended up running about last night and wasn't thinking straight. After looking at the images that I got this morning I could see I needed more back focus and with a full size chip in the camera it makes sense.

I have a 50mm adapter handy so will give it a try next time I'm out there.

I was so chuffed that I had managed to get the mount polar aligned with the guide on your website and some help from here, its a shame I have to take it all apart at the end of the night.