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Help on Bahtinov Mask Generator parameters for 18-55mm lens


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I am planning to make my own Bahtinov mask for my canon 18-55mm stock IS lens. I've come across this website (http://astrojargon.net/MaskGenerator.aspx) which creates templates for the mask. I've experimented with these settings (focal length = 55mm, clear aperture= 55mm/5.6 = 9.82 mm, Edge thickness = 10). Unfortunately the template turns out to be small. I've somewhat "intuitively" chosen the parameters. It would be great if someone explains what focal length and clear aperture actually mean?



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I've tried, and to be honest, i gave up. Smallest mask i could make with a laser cutting machine was for a 200mm lens - and then the gaps to cut out was thinner then 1mm.

What camera are you using? I'm using the 550d, and with live-view it's pretty easy to focus om a medium bright star at 10x zoom. I've never had to use a mask for anything that wide before.

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You could make a Bahtinov mask with thread as mentioned somewhere else in these forums of maybe try a Y mask. I made a Y mask simply using a scrap of cardboard and pair of scissors. Worked with my 200mm lens :)

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