Field-stop of the Celestron stock 20mm eyepiece
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3-element design with a 20mm field-stop, 58 degrees AFOV, a little germ covered in dirts
Photo Information
- Taken with NIKON CORPORATION NIKON D40
- Focal Length 55 mm
- Exposure Time 1/500
- f Aperture f/11.0
- ISO Speed 400
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