Camera: Nikon D90 Lens: 18.0-105.0 mm f/3.5-5.6
Exposure: 0.001 sec (1/1000)
Aperture: f/4.0
Focal Length: 18 mm
ISO Speed: 200
Askar SQA55: A Quintuplet Refractor for Wide-field Astrophotography
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The Askar SQA55 is a compact astrograph designed for astrophotographers who
want a fast, wide, and highly corrected imaging system. It brings together
a ...
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