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The design itself was created by Russian astronomer, Paul Bahtinov. 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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Unlike autofocus and star measuring software tools, this “old school” method can be done without the use of an external computer, and only takes a minute. 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. Related Post: Practical Focusing Tips for Astrophotography Use a Bahtinov mask for better focus 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.
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Bahtinov Mask Guidedave's Astro Tools Download In many cases, I did not realize how bad the focus of my image was until I attempted to process the final image. Over the years, I’ve had my fair share of deep-sky astrophotography focus mishaps. 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. This process is an essential step of any deep-sky astrophotography session. The mask shown is from here I bought a spare Samyang 8mm fisheye lens cap from Amazon and drilled a 25mm hole in it, and then glued a 62-67mm step-up ring to it with epoxy resin, being sure not to get any glue on the latches.Ī Bahtinov mask can help you achieve a sharp focus for your astrophotography images. So I read about Bahtinov Masks and came up with the following DIY solution for my Samyang 8mm f/2.8 fisheye II and 12mm f/2. Attached below is a cropped sample of what the B-mask result looked like to me (actually using Vega. Last night I decided to use and trust my Bahtinov mask. Bahtinov mask vs Minimum FWHM (with spider vanes) - posted in Beginning and Intermediate Imaging: I have a VC200L and to focus, Ive always relied on just finding the minimum FWHM reported by BYEOS on just about any bright star (like Vega). The Bahtinov focus technique works best with longer focal lengths. This Bahtinov Focus Mask snaps-in to your camera lenses that have the specified size filter thread. Pavel Bahtinov, a Russian amateur telescope maker and astronomer, created this simple, very intuitive method and the device has universally been named after him: The Bahtinov Mask.
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Although Ive managed to see quite a lot & image stuff through it, Ive never actually used the Bahtinov.This is probably because I dont have a clue how to use it. Whe I got my first telescope, about a year ago, it came with quite a few extras including one of these masks. This William Optics Bahtinov Mask attaches to your telescope's dew shield with diameter compatibility between 75 to 110mm aperture.