[dylan_odonnell (Dylan)]

Originally Posted by Alchemy

Distance from t adapter to camera chip will need be the same for both cameras, if the CCD chip is closer (usually) then you can add spacers, Usually focal reducers have a standard ideal distance to the film plane from the reducer. Either side of that will often cause your corner stars to become distorted

Thanks I think you are right, the CCD chip does look about an inch closer in the train than the DSLRs inset cmos. I thought the focal reducer might have reduced that focus point but probably not enough.