Bahtinov Focusing Mask Generator Version 0. Input values appropriate for your telescope, and press the Generate! Basic parameters Enter these three values, press Generate! Focal length mm Focal length must be a positive number.

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This is the same method I used to build an aperture solar filter as well. Required tools and materials: Binder made from hard, thin plastic must be non transparent Stanley or a hobby knife and scissors Contact glue Ruler and a marker pen Printer A3 if possible for larger scopes Required materials for a 8" mask First step was to print the mask - you can use the provided templates , or use the original bahtinov mask generator , and then print it any modern browser can open the generated.

In my case I had to print the mask on two pages. Then I cut one half of the plastic binder, and attached to it my printed mask. It is important to keep the lines straight and parallel to ensure that diffraction spikes will be bright and thin Then the annoying task - cutting the plastic. I did it by placing a metal ruler over each slot, and slicing several times over each edge, without applying too much pressure.

Cutting the slots after the slots were cut out and the paper removed - the mask looks like this: Complete cutouts in plastic Next step was to measure the telescope outter diameter, and to draw a circle on plastic.

Then I cut the mask out using scissors, while leaving 12 small rectangular sections around the circle. I glued the strips to the bent sections using a strong contact glue.

You should follow the instructions written on the glue tube, which usually tell you to spread the glue on both surfaces and then let it dry for minutes before attaching them together: Attaching the mounting ring The final result: A complete Bahtinov mask In a similar way - a daylight solar filter can be made, by glueing a sheet of " Astrosolar " film or a similar product between two circles of plastic. Another tip is to make the inner diameter of the mask slightly larger than required mm and add a thick soft tape inside - this way the mask will be held in place much firmer.


Bahtinov mask

Better Focus using a Bahtinov Mask February 4, Tutorials 10 Comments A Bahtinov mask can help you achieve a sharp focus for your astrophotography images. This process is an essential step of any deep-sky astrophotography session. With so much time and effort put into your polar alignment and autoguiding accuracy, it would be a shame to spoil a photo due to poor focus. In many cases, I did not realize how bad the focus of my image was until I attempted to process the final image. You can avoid this unfortunate circumstance by using a simple tool that effectively confirms that your focus is as sharp as can be, a Bahtinov mask. Related Post: Practical Focusing Tips for Astrophotography Use a Bahtinov mask for better focus No matter which type of camera you use, a Bahtinov mask can help you achieve a higher level of accuracy when focusing your telescope or a camera lens. The process involves placing the focusing tool on the objective lens of your telescope or camera lens, and observing a bright star.

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Home Made Bahtinov Focusing Mask & Templates

Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov Russian : Павел Бахтинов in The mask consists of three separate grids, positioned in such a way that the grids produce three angled diffraction spikes at the focal plane of the instrument for each bright image element. In reality, all three spikes move, but the central spike moves in the opposite direction to the two spikes forming the "X". Optimal focus is achieved when the middle spike is centered between the other two spikes.



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