Eyepiece

#580028
Andrew Smith
Participant

James, in addition to the points Peter has made on the size of the exit pupil another constraint is the size of the field stop that can fit into a 2″ focuser. You need a larger field stop at longer focal length.

By the way if you do get the exit pupil larger that that of your eye you just lose some light and have to shift your head to look around the field.

Regards Andrew