Test Results

Art.–Nr. SKY-UWA-20

Skywatcher Ultra Wide Angle 20mm

Sharpness:

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°.

Contrast:

Very good contrast.

Aberration:

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.

Summary:

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.

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