Using a Bahtinov mask to focus with a Canon DSLR

The Bahtinov mask is a very simple device that generates a specific diffraction on a star, and with the appropriate magnification, makes it very easy to precisely focus a telescope.
In this short video I demonstrate how to focus using a Bahtinov mask and a Canon DSLR.
You can generate a mask for your aperture and focal length here astrojargon.net...

[@rambosupreme]

I love your accent ❤

[@paolofat52]

Excellent instruction !