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Hi Allan
I have the 50mm and it is a good eyepiece for the money but the eye relief is huge making it difficult to use. I have not tried the 42 mm version but do have a 40mm GS reverse kellner (3 elements) which is even cheaper and for me more comfortable with great througput. The 50mm could be modified with a cone on top to position the eye better.
regards
Andy
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