Dimitris
You have the correct spacing for your camera to ccdt67. It works like this 16mm for the ccdt67+ 30mm for your spacer+ 55mm for your t ring and camera to the chip= 101mm. Perfect spacing.
That's the way it works, if you had a qhy10 ccd the spacing from the front of the camera to the chip is 20mm which gives an extra 35mm to play with and thus you can attach the ccdt67 into the focuser.
Hope you now get some clear skies.
Allan
|