10mm Huygens No-name
Sharpness:
Not convincing.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
As small as 27°. Really an eyepiece with a tunnel feeling.
Contrast:
Bad. No lens coating.
Aberration:
-
Eye Relief:
Without any problems in use.
Mechanical Quality:
Very simple manufactured, e.g. loss of coating (paint) after some use.
Summary:
Clearly not recommended for use for astronomical purposes.