6mm orthoscopic (Japan), about 25 years old
Sharpness:
Very good sharpness, becomes worse just close to the edges.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Field of view is 39°.
Contrast:
Not good, but not terrible. In comparison one will see, that today’s
multi-coatings are clearly an improvement.
Aberration:
-
Eye Relief:
Not too bad despite the short focal length.
Mechanical Quality:
Simple, but not bad.
Summary:
Not really a good eyepiece, but not a deterrent example.