Bahtinov focus mask for Sigma 150-500 zoom lens
thingiverse
This focusing aid, designed for Sigma 150-500 APO DG OS lens at full focal length, fits into the lens hood and assists in astrophotography. It creates a pattern in viewfinder/liveview by pointing camera at a bright star; focus is adjusted until pattern's symmetry is achieved. The mask's creation is detailed on Astrojargon.net website using their MaskGenerator, and it should be printed at one-tenth size in black ABS. Handle with care as it breaks easily during removal from the build plate, and some slot trimming might be needed.
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