TRI-Bahtinov Focus Mask - Celestron 52° FOV Red LED flashlight features three

Red LED flashlight features three brightness levels to preserve your night vision

The Celestron CG-5 Universal Mounting Plate is a basic accessory that allows you to attach a wide range of telescope accessories to the mounting platform of an Advanced CG-5 or Advanced VX mount

L-Enhance is a narrow tri-band filter

and weighs 11 lb

you can make tension adjustments to keep the phone firmly in place

TRI-Bahtinov Focus Mask - Celestron 52° FOV Red LED flashlight features threeWhat 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