cant seem to get jupiter right.

i have a canon d5000 attached directly to the back of my celestron cpc 9.25 hd. scope is rated an f10. I have tried setting my asa to 1600 and also 800. I have tried using live view and focusing. No matter what i try it is very over exposed or under exposed. Any suggestions would be helpful.

Thanks

Peetyg

Peter Gottstein said:

i have a canon d5000 attached directly to the back of my celestron cpc 9.25 hd. scope is rated an f10. I have tried setting my asa to 1600 and also 800. I have tried using live view and focusing. No matter what i try it is very over exposed or under exposed. Any suggestions would be helpful.

Thanks

Peetyg

Re you taking a single image or a movie?

Hey, Peter...
Another suggestion would be to set the exposure manually, if you are not. Auto-exposure won't work for this kind of target.

What are you using to view the images after they are acquired? Maybe the software is not stretching them correctly. Are yo measuring the pixel intensity to make sure why looks overexposed is actually at max value (2048 I believe for a DSLR).

Post a couple rAW files cropped so we can see under/over exposed.

Also, 800 ASA is probably OK, but I'd personally drop it down to 400. What exposure times are you trying?