Test Results


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 good.



Very slight cushion distortion, minor chromatic errors (colored fringes) towards the edge.


Eye Relief:

Very comfortable, if neglecting the turning of the head, if you would like to see the edge as sharp as the center.


Mechanical Quality:

Good quality with rubber eye guard, grip coated body.



Also: take other eyepieces, if you do not need this long eye relief.