Art. –Nr. SKY-SP-40
Skywatcher Super Ploessl 40mm
Very good sharpness, better at the edge than in the center.
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Field of view is approx. 36°.
Due to the multi coating and use of just four lenses a very good contrast.
Close to the edge slight cushion distortion.
Comfortable at this long focal length.
Fine. You do not need more to keep it for a long time.
A good eyepiece in any way, but not the right one if you like to have a big apparent field of view.