Hi Brad
To use a webcam to take pleasing images of planets and multiple stars, instead of reducing your focal length via a reducer/corrector, you will need to increase it with a Barlow lens to reveal nice detail on e.g. Jupiter and Saturn, as well as achieving a nice separation between multiple star components.
I use the DMK21AF04 mono and DBK21AF04 colour CCD cameras; both have a chip at 640x480 pixels. For colourful double stars, I have used the DBK (colour) camera at the prime focus of a Tak Mewlon 180mm F12 as well as using a x2 Barlow lens and it gives excellent results.
Here are some links to a few images:
http://www.iceinspace.com.au/forum/a...se.php?a=28064
http://www.iceinspace.com.au/forum/a...se.php?a=28269
http://www.iceinspace.com.au/forum/a...se.php?a=28279
http://www.iceinspace.com.au/forum/a...se.php?a=29041
http://www.iceinspace.com.au/forum/a...se.php?a=29579
http://www.iceinspace.com.au/forum/a...se.php?a=29581
http://www.iceinspace.com.au/forum/a...se.php?a=29580
The webcam should be fitted with an adapter that allows the webcam to be inserted directly into the Barlow, or eyepiece holder, when used at prime focus. This means that you should not require a custom adapter to clamp the webcam.
Cheers
Dennis