Test Results

               

20mm Huygens No-name

 

Sharpness:

Within of 20° field of view very good.

 

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

 

Apparent Field of View:

As small as 25°. Really an eyepiece with a tunnel feeling.

 

Contrast:

Bad. No lens coating.

 

Aberration:

-

 

Eye Relief:

Without any problems in use.

 

Mechanical Quality:

Very simple manufactured, e.g. loss of coating (paint) after some use.

 

Summary:

Good sharpness is the only pro. All other points are far away from a recommended use for astronomical purposes.

 

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