Art.–Nr. TS-SP-04
TS Super Ploessl 4mm
Sharpness:
Not convincing, especially in the center. Even at 4mm there are better ones.
Our measurement system is diffraction limited at this focal length to about 1.4
arc minutes.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is approx. 48°
Contrast:
Just good contrast.
Aberration:
Very slight cushion distortion.
Eye Relief:
Very short eye relief because of the short focal length. Viewing the
complete field of view is not possible without looking into the eyepiece under
different angles.
Mechanical Quality:
Nice. You do not need more to use it for a long time.
Summary:
Not too bad for a 4mm eyepiece – but I have seen better ones.