Test Results

 

Art. –Nr. RE-SWA-20

Super Wide Angle 20mm

 

Sharpness:

Very good at the center, but drops towards the edges

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

 

Apparent Field of View:

Our measurement gives 67° - close to the manufacturer data.

 

Contrast:

Very good.

 

Aberration:

Slight cushion distortion as well as field curvature.

 

Eye Relief:

Eye relief is close to be comfortable, but you can not wear eye glasses.

 

Mechanical Quality:

Good quality with rubber eye guard, grip coated body. Fully multicoated and well blackened inside.

 

Summary:

You can not use the full apparent field of view in good optical quality, and really not recommended for F/5 or F/4. However, as the field is much larger than for Plossl eyepieces, there is an advantage at a more or less equal price. Edge quality is enhanced remarkably when combining this eyepiece with a Barlow lens.

 

 

 

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