Art. –Nr. SKY-SP-17
Skywatcher Super Ploessl 17mm
Sharpness is very good within 30° apparent field of view. Only close to the edges not convincing.
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Field of view is approx. 46°.
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. Just the missing sharpness at the edge is a little bit disappointing.