|
Mark,
I've never used one of these before. Do you need to change focus when you change zoom, or does it stay (reasonably) in focus throughout the zoom range?
Reason for asking is that I want to use it as a parfocal eyepeice to assist getting the image on a CCD chip. Doing so with a 12.5mm EP only means that often the star I'm aligning on is outside the FOV and I need to keep changing EP's to find the star then re-centre before putting my imager in. A small change in focus is fine, but if gross changes are required, won't be of much use.
Also, I assume this is an older type, and doesn't have any "stops" for particular ranges?
Turbo
|