Focus points on TAKs

I have a TAK FS102 & FS60C that I will be interchanging two SBIG cameras on (ST-237A & ST4). Is there anyone out there that has used these telescopes with these cameras? I would like to know what combinations of extension tubes it takes to get the cameras in focus?

Peter,

First, are you using a reducer on either scope?
If you are then you need a specific distance from the reducer to the CCD Chip on the camera.

If not
how are you trying to focus the cameras?

Mark

This will help you

http://www.buytelescopes.com/container.asp?dest=/manufacturers/takahashi/back_focus_guide.htm

Thanks
Herb