Art. –Nr. SKY-LE-20
Skywatcher Long Eye Relief 20mm
Very good in principle, but the sharpness is only achieved when looking into the eyepiece under a certain angle. If you look straight, only about 25° field of view are really sharp.
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Field of view is approx. 47°.
Very slight cushion distortion, minor chromatic errors (colored fringes) towards the edge.
Very comfortable, if neglecting the turning of the head, if you would like to see the edge as sharp as the center.
Good quality with rubber eye guard, grip coated body.
Also: take other eyepieces, if you do not need this long eye relief.