Clear Bahtinov focus mask, 150mm square — fits 150mm filter holder systems. The clear construction lets more light reach your sensor for brighter star images and stronger, more visible diffraction lines. Slides into the holder slot, gives you perfect focus in seconds, and slides out cleanly when you're done. Made in our own shop in the USA — American materials, American machinery, by Americans.
Works with most 150mm filter holder systems — Lee, NiSi, Cokin XL, Haida, Wine Country Camera, and others. Holder and lens-specific adapter ring sold separately.
Why a Farpoint Clear Bahtinov
- Clear construction for brighter focus images. Instead of opaque material, the Clear Bahtinov uses a transparent base that lets more light reach your sensor — producing brighter star images with stronger, more visible diffraction lines for easier focus reads.
- Drops into a 150mm holder slot. Slides cleanly into the filter slot — focus check, slide out, shoot. Same workflow as any 150mm filter swap.
- Made in the USA. Designed and manufactured in our own shop with American materials, American machinery, and American workmanship.
- 15+ year track record. Farpoint has been making focus masks longer than nearly anyone in the hobby.
What's in the box
- 1× Farpoint Clear Bahtinov Focus Mask, 150mm square
- Instructions for use
What you'll need
A 150mm filter holder system (Lee, NiSi, Cokin XL, Haida, Wine Country Camera, or similar) mounted on your camera lens via the appropriate lens-specific adapter ring. Both are sold separately at any photography retailer. Once your holder is set up, the Clear Bahtinov slides into the filter slot just like any other 150mm filter.
How a Bahtinov mask works
Slide the mask into your 150mm filter holder and aim at a fairly bright star. Take a short exposure. You'll see three diffraction spikes — two angled spikes forming an X, plus a third central spike that's offset to one side or the other when the lens is out of focus. The clear construction lets the diffraction lines show up more strongly than an opaque mask. As you adjust the focus ring, the central spike moves across the X. When it lands perfectly centered and symmetrical, you've hit optimum focus. Slide the mask out and start shooting.
A star coming into focus through a Bahtinov mask
Free software for precise focus measurement
If you want machine-precise focus instead of eyeballing the spike pattern, free open-source software can analyze the diffraction image automatically:
- Bahtinov-Collimator — a Windows tool that quantifies focus error directly from your image. Available on GitHub.
- APT (Astro Photography Tool) — Bahtinov mask analysis is built into APT's image-capture workflow.
Bahtinov-Collimator analyzing a star image for precise focus measurement
Need a different size?
The Clear Bahtinov is also available in 85mm (fits Cokin P holders) and 100mm (fits Cokin Z holders) sizes. We also make opaque ABS Bahtinov masks for Cokin P/Z holders and round filter threads from 52mm up to 82mm. See all DSLR lens Bahtinov masks →
Related guides
- Focus Masks Buyer's Guide — material comparison, custom-fit vs adjustable, choosing the right type
The unmistakable diffraction spike pattern at perfect focus
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