Home Made “Y” Mask

 

img_5652-1I’ve heard of Bahtinov focusing masks masks but now the cool kids are using Y shaped masks. From what I can see the dimensions and even the angles are not critical. Somehow the shape causes a diffraction pattern that has a specific shape when the camera is well focused(see below where the three spikes meet). I’m hoping to try it tonight if the sky is clear enough.

 

 
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