AstroZap Glass Solar Filters Size:41mm-48mm (clear aperture 38mm) With iOptron's StarFi you'll be

With iOptron's StarFi you'll be wirelessly connected

Built-in polar alignment program to polar align on any star in the sky

5x Barlow is threaded to accept 2” filters

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

9 Minimum Magnification 27 Maximum Magnification 374 Light Gathering (compared to next size down) 11% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext

AstroZap Glass Solar Filters Size:41mm-48mm (clear aperture 38mm) With iOptron's StarFi you'll beDescription 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