Art.–Nr. TS-PL-20
TS Ploessl 20mm
Sharpness:
Very good sharpness within 30° field of view. Towards the edge not
convincing.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is approx. 45°
Contrast:
Very good contrast because of good multicoating and use of just four
lenses.
Aberration:
Very slight cushion distortion.
Eye Relief:
Comfortable.
Mechanical Quality:
Simple, but not bad. Unfortunately no blackened filter thread.
Summary:
Very good and inexpensive Ploessl. Just a small minus for insufficient
edge sharpness.