Art. –Nr. SKY-SP-20
Skywatcher Super Ploessl 20mm
Very good sharpness, just close to the edge not perfect.
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Field of view is approx. 44°.
Due to the multi coating and use of just four lenses a very good contrast.
Close to the edge slight cushion distortion.
Fine. You do not need more to keep it for a long time.
A good eyepiece in any way.