With a large telescope and a camera behind it, a blurry night takes a lot of time. With this Bahtinov mask, you can see exactly when your star is sharp.
You place the mask in front of the opening and aim at a bright star. The mask makes three light spikes visible. If the middle spike is exactly between the other two, the focus is good and you can remove the mask. It fits on a tube or mist cap with an outer diameter of 292 to 368 mm.
Measure the outside of the front of your tube or dew cap so that you are sure you are within this range. Set the focus while looking at the live image of the tube. Your astro camera When you look at it with a short exposure time, you can see the spikes shift immediately.
For thinner or thicker tubes there are the mask for 216 to 292 mm and the mask for 368 to 444 mm.
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