Hi! you guys... I'm planning to add a grating (SA-100 or SA-200 depending...) in my CFW-9 filter Wheel (1.25'' filters) for basic spectroscopy, and I need to know the distance between the CFW-9 filters and my ST-10 XME CCD chip. My installation is as follows: C11 Edge/Celestron focal reducer/Pyxis 3 rotator/AO-8 adaptative optics/CFW-9 filter Wheel and ST-10XME CCD camera... This info is needed for choosing either the SA-100 or SA-200, depending on the grating to sensor distance, and will same me time and effort! Regards! Roger Venne
Roger, Here is some info on the back focus of the camera itself. The CFW-9 is "0936 thick. Knowing the BFD of the camera, I would measure the wheel at the exact point where the filter lip is and add the two together to be exact.