In Barbell: Telescope Reviews: C14 and SBIG ST-4000XM

Hello there,I'm thinking about buying CCD to be used with my C14. I plan to take photos with focal reducer, bringing focal length down to 2450mm. I am completely new to CCD photography, so please excuse maybe a little dumb questions. I found out here that Pixel ratio should be 2.5. However, this camera has pixel size of 7.4u, which creates pixel ratio of only 0.619! What problems can I have when t ...Barbell