Kurt, If you are going vai telescope on a tracking setup, you want to go prime (imho). This is by far the best way to shoot. They make t-adapters and t-rings that fit the camera and make it a 2" eyepiece. Depending on the scope you decide to use, you will want some sort of focal reducer or field flatener. When you shoot prime, the scope is the camera lens. This gets the most possible light in, and also helps reduce vignetting. With the APS-C size sensor, you want to use a 2" optical train to help with the vignetting. Also, I would make sure you have enough travel in your focuser to reach focus with the camera. The CMOS chip is set way back - I've had to get low profile focusers on all my scopes. If you are shooting with telescope afocal, just keep ti wide open all the time. Getting enough light is always the challenge. David On 3/29/2011 8:11 PM, Canopus56 wrote:

Dave and Mike,

Thanks for the tips. It looks like Lodriguss's description is a good short online list for settings.

Do you match the f/r on the camera to your telescope barlow combination f/r or do you just set it wide-open at the lowest possible f/r that the camera will set?

- Kurt

Lodriguss's list http://www.astropix.com/HTML/I_ASTROP/SETTINGS.HTM

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