Bahtinov focus mask for Cokin P filter holders, 84mm square. Slides into the filter slot of a Cokin P holder, 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 any Cokin P (M-series) filter holder. Holder and lens-specific Cokin adapter ring sold separately.
Why a Farpoint Cokin P Bahtinov
- Drops into a Cokin P holder slot, no fiddling. Slides cleanly into the filter slot — focus check, slide out, shoot. Same workflow as any Cokin filter swap.
- Made in the USA. Designed and manufactured in our own shop with American materials, American machinery, and American workmanship.
- Indestructible ABS plastic. Won't crack, warp, or shatter like aluminum or acrylic alternatives. Built to last decades.
- 15+ year track record. Farpoint has been making focus masks longer than nearly anyone in the hobby.
What's in the box
- 1× Farpoint Bahtinov Focus Mask, 84mm square (Cokin P size)
- Instructions for use
What you'll need
A Cokin P filter holder mounted on your camera lens via the appropriate lens-specific Cokin adapter ring. Both are sold separately at any photography retailer. Once your Cokin holder is set up, the Bahtinov mask slides into the filter slot just like any other Cokin filter.
How a Bahtinov mask works
Slide the mask into your Cokin P 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. 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?
We also make Bahtinov masks in round filter threads from 52mm up to 82mm, a Cokin Z (103mm) version for Pro-series holders, and Clear-construction versions in 85mm, 100mm, and 150mm sizes for brighter focus images. 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
You may also like
Recently viewed