Test Results

               

5mm Huygens No-name

 

Sharpness:

Terrible.

 

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

 

Apparent Field of View:

As small as 31°.

 

Contrast:

Worst I have ever seen. No lens coating.

 

Aberration:

-

 

Eye Relief:

Very short eye relief makes it difficult to look in.

 

Mechanical Quality:

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

 

Summary:

Take the sleeve, if you have need for that. Dispatch the remains – strictly recommended.

 

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