Cokin Unveils Pure Harmonie, the World’s Skinniest Lens Filters


French optical filter company Cokin has launched a new line of lens filters under the brand name Pure Harmonie. The new filters are unique in that they’re the thinnest and lightest in the world — the UV filter in the set measures only 3.3mm (~0.13in) thick!

There are currently three filters in the Pure Harmonie stable: the Multi-Coated Anti-UV (UV MC), the Circular Polarizer (C PL), and the Variable Density Neutral Gray (ND X).


As we mentioned above, the smallest and lightest of the three is the UV filter. Cokin calls it “the contact lens of your lens.” Apparently it’s almost invisible when it’s mounted to the front of your lens.

It’s designed to cut down on haze and protect your lens from dust and scratches while barely adding any extra weight or dimension to your kit. The filter is made of “extremely resistant glass,” and Cokin says the thinness of the filter allows it to cut down on lens flare.


At 4.5mm, the Circular Polarizer filter is a bit thicker than the UV. However, it’s still the thinnest and lightest polarizing filter in the world.

Cokin says that despite its small form factor, the filter offers light transmission that’s the best in its category when compared to rival filters.


The Variable Density Neutral Gray filter is the chubbiest of the three new filters with a thickness of 9.5mm. It goes from ND2 (1 f-stop less light reaches your sensor) to ND400 (8+ f-stops) through rotating the front ring of the filter. Like the other two filters, it’s the thinnest of its type in the photography world.

You can purchase Pure Harmonie filters for various lens sizes over on Amazon. The cheapest ones cost around $50, while the fancier filters will set you back hundreds.

Cokin Pure Harmonie (via The Phoblographer)

  • Samcornwell

    It’s still a Cokin though. Will be interesting to see how it compares with LEE and B&W.

  • Guest

    What do they need to be so thin for…they’re just filters.

  • 11

    thinner the filter, harder to rotate, especially the polarizer.

  • ninpou_kobanashi

    “thinness of the filter allows it to cut down on lens flare”

    At least, that’s they say. I personally do not use filters, unless it’s for a special purpose. i.e. CP or ND.

  • Brian Carlson

    With a name like “Pure Harmonie” the next thing Cokin will debut is a horribly auto-tuned teenage boy band.

  • TSY87

    If you run a UV and CPL, you will get vignetting on some lenses. The thinner the filter, the less chances of the black ring getting in the way of the image. This is more apparent with wide angles lenses of course.

  • Tommy Sar

    I’ve never heard of them until now. Are they terribad?

  • Marc

    wow, nice to see a more affordable variable ND filter (unless there’s cheaper ones that I don’t know about)

  • Bua

    Yes we need comparisons with Lightcraft and Singhray variable ND filters.

  • lidocaineus

    Curious – why would you stack a UV + CPL?