TS Super Ploessl 9mm
Good within about 35° field of view. Things are getting worse to the edges.
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is approx. 47°.
Very good contrast because of good multicoating and use of just four lenses.
Slight cushion distortion.
Despite only 9mm focal length comfortable.
Nice. You do not need more to use it for a long time.
Nice, high-contrast eyepiece.