STFM80

FM-80

Starfield

This Bahtinov Focus Mask from Starfield provides an easy way to focus on the deep sky. Simply place it over the aperture of your telescope and focus on a bright star in the dark sky. When the image your camera captures shows even diffraction spikes with a neatly bisected X, the deep-sky objects in your view are in perfect focus. This mask fits tubes or dew shields with an outside diameter of 87-105mm.