Bahtinov Mask - (Various Sizes) Telescope Aperture Size:(215 - 260mm) helps the app match the

helps the app match the star patterns it detects with its internal database

14 stops dynamic range and 3

Large back focus for correctors

The optics of the VMC260L surpass that of the traditional Schmidt-Cassegrain and are only 650mm long despite its high focal length of 3000mm

The Y power cord is designed to connect in-line with the camera's cooler power supply for convenience

Bahtinov Mask - (Various Sizes) Telescope Aperture Size:(215 - 260mm) helps the app match theThe Bahtinov Mask is a focusing tool which enables extremely precise adjustment of your telescopes focus particularly useful if trying to focus a dedicated astro camera (but also works fine for DSLR)Attaching the Bahtinov Mask to your telescope or lens is very simple. Each mask is supplied with 3 screws. Remove the plastic from the screws, put them through the designated holes and then pull the plastic covers back over the screws. Now you can attach