AstroZap Glass Solar Filters Size:41mm-48mm (clear aperture 38mm) With its long eye relief

With its long eye relief of 15mm

2” (51mm) to 2 ¼” (57mm)

Designed for use with 400mm to 660mm focal length refractors with f/5 to f/7

41 arc seconds Resolution (Rayleigh) 0

• Real Carbon Fiber side plates

AstroZap Glass Solar Filters Size:41mm-48mm (clear aperture 38mm) With its long eye reliefDescription The sun is a fascinating, dynamic object. Its surface is surprisingly detailed and changes frequently. The observing hours are more convenient. However, there are a few rules to follow before using your telescope on the sun. The first rule of solar observing is never point your telescope at the sun without a proper filter. The second rule of solar observing is always inspect the filter before placing it on your telescope prior to observing