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In addition to Bahtinov masks for DSLR
It's compatible with refractors equipped with a 2" focuser
0 Focal Length (mm) 32 Barrel Size (in
Red LED flashlight features three brightness levels to preserve your night vision
TRI-Bahtinov Focus Mask - Celestron 52° FOV In addition to Bahtinov masksWhat is the Tri Bahtinov? Essentially three Bahtinov masks in one, rotated over 120 degrees. It gives you three lines and three crosses to check focus and collimation, along three axis simultaneously. In addition to focusing, the Tri Bahtinov so also indicates collimation status along three axis. This is interesting for e. g. Schmidt Cassegrain telescopes, where the collimation is done by push pull screws of the secondary mirror along three axis. When
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