Focusing a refractor plus field flattener attached to DSLR

Forums Imaging Focusing a refractor plus field flattener attached to DSLR camera Focusing a refractor plus field flattener attached to DSLR

#577236
Richard Miles
Participant

Hi Roger – Your issue isn’t so much trying to focus but rather ‘How to obtain a flatter field?’

One explanation can be that the focal plane of your camera is not exactly orthogonal with the optical axis. That may mean that the way the camera has been attached is skewed slightly.