Test Results


Art.–Nr. SKY-UWA-20

Skywatcher Ultra Wide Angle 20mm



Very good sharpness within 55° apparent field of view, but gets a bit worse close to the edge.


x-axis: distance from optical axis in °, y-axis: resolution in arc minutes


Apparent Field of View:

The apparent field of view is approx. 63°.



Very good contrast.



Very slight cushion distortion.


Eye Relief:

Not too easy. You will need some practice in finding the correct distance where the center as well as the edge provide a sharp image at the same time..


Mechanical Quality:

Good quality with foldable rubber eye cup.



A nice wide angle eyepiece, but a minus for the eye relief. At F/5 you will see noticeable aberration close to the edge. Recommended for F/6 or slower.