Quote:
Originally Posted by iceman
Regarding focusing your DSLR, you either need to:
a) Get a very low profile focuser
b) Move your mirror up the tube
|
I recently replaced my focuser with a 10:1 and debated the low profile for this reason, but was told that the GSO/Bintel one was unstable with a dSLR attached, so decided there wasn't much point!
As for moving the mirror, that would make the scope even faster wouldn't it? Thus coma problems with certain eyepieces would be even more of a problem? Also, I thought the mirror was ground to match a certain focal length, presumably that creates problems too?
Quote:
Originally Posted by iceman
So that leaves you with 2 choices:
1) Go afocal. Use a 30mm eyepiece and a lens that lets you squish up against it
2) Get a smaller scope for full disc moon shots.
I used to do #1, now I do #2. I got an ED80 for the full disc shots.
|
I find that with afocal, using both the dSLR and my wife's compact digital camera I get dark patches in the image and vignetting is a problem too. Perhaps the dark patches are due to some sort of vignetting?
I have been wondering about getting a small refractor on a driven mount for imaging. Don't have the cash at the moment though....
