Art. –Nr. SKY-APEX-42
Skywatcher Apex 42mm 2”
Very good sharpness for the whole field of view, if you turn your head. If looking straight, just the center is sharp, the edge will look blurred.
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°.
Very good contrast.
Typical for the Kellner design distortion changes with the look angle, therefore the image is rotating a little bit when turning the head.
Relatively simple, but not bad.
A fine and optically good eyepiece. Do not use with telescopes faster than F/6.