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Hi everyone, newbie with a newbie question. When using a Bahtinov mask on a DSLR lens, can I clip the mask onto the lens hood or do I need to remove the hood to use mask? I don't particularly want a bahtinov mask that screws into the lens as I rather use one of the adjustable ones so I can use on different lenses so one that clips onto the lens hood would be ideal. Also, some of the cheaper bahtinov masks I've seen have pretty large gratings, does size matter to Bahtinov? Thanks everyone, clear skies. |
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Perfectly fine to use a Bahtinov Mask in front of the lens hood. That is how I've always used mine, and it makes them easier to remove without disturbing anything. The size of the gaps in the grating does matter. The shorter the focal length, the finer the ideal grating should be. At some point (around 50mm f.l. or so), it becomes impractically fine, and the only semi-effective Bahtinov masks are laser-etched on to glass or acrylic. For 135mm-300mm focal length lenses, I have 3D-printed masks that fit over the lens hoods. Printing in PLA doesn't work well with the grating so fine, I have used Vinyl. I should say, if you don't have ideal spacing (gaps are too large) the Bahtinov mask will still sort of work, just not as effectively. The pattern may only show up on the brightest of stars, and the lines in the pattern will be thicker making it harder to judge when the line is centered in the X pattern. Additional notes on 3D printing them if interested: -This is a nice generator for getting the pattern: https://satakagi.github.io/tribahtinovWebApps/Bahtinov.html -From there you can take the SVG into a 3D app to make a collar that fits around your lens hood. I have used the free web application TinkerCad for this: https://www.tinkercad.com/ and made a video (needs an update) a few years back: https://youtu.be/a0Qk5jzsZfc |
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| Many thanks Nico. I was hoping that would be the answer, I was concerned that removing a Bahtinov mask that screwed into the lens could upset the focus. Thanks for taking the time to reply to a novice question. |
