Test Results

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.

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