Cokin

Cokin CO-PHUV77 77mm Pure Harmonie Ultra Slim UV Filter

4.4 (128 reviews)

At just 3.3mm thick, the Cokin Pure Harmonie UV filter protects your lens without adding vignetting or weight.

$177.75*
In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Cokin 77mm Pure Harmonie Ultra Slim UV-MC Filter is engineered for photographers who refuse to compromise on image quality for the sake of lens protection. At just 3.3mm thick, it claims the distinction of being one of the thinnest UV filters on the market, a critical advantage for anyone shooting with wide-angle or ultra-wide-angle lenses where thicker filter rings can intrude into the frame and cause dark corners. The filter uses exclusive high-transmission glass that allows maximum light to pass through while blocking ultraviolet wavelengths that can cause haze and reduce contrast in outdoor photography.

The standout feature is the EVERCLEAR 5 multi-coating technology applied to the glass surfaces. This five-layer coating provides resistance against water, oil, dust, soil, and scratches, which means the filter stays cleaner in challenging shooting conditions and is easier to wipe down in the field. Because the filter is so lightweight, it does not add any meaningful burden to your lens or affect the performance of autofocus systems. For photographers who keep a UV filter permanently mounted as a protective element for their front lens element, the Cokin Pure Harmonie delivers that protection with minimal optical compromise and virtually no mechanical downside.

Key Features

The thinnest UV filter on the market at 3.3mm

Super lightweight which will not compromise AF systems

Exclusive new high transmission glass

Reduces vignetting issues on extreme wide angle lenses

Ever clear 5 multi coating technology

Specifications

Filter Size
77mm
Filter Type
UV-MC (Multi-Coated)
Thickness
3.3mm
Coating
EVERCLEAR 5 Multi-Coating
Glass
High-Transmission Scratch-Resistant Glass
Profile
Ultra Slim
Brand
Cokin
Model
CO-PHUV77

Pros & Cons

👍 Pros

  • Ultra-slim 3.3mm profile virtually eliminates vignetting on wide-angle lenses
  • EVERCLEAR 5 multi-coating resists water, oil, dust, soil, and scratches
  • Extremely lightweight construction does not interfere with autofocus systems
  • High-transmission glass preserves image clarity and sharpness
  • Provides continuous physical protection for expensive front lens elements

👎 Cons

  • The ultra-slim frame makes it more difficult to grip and remove from the lens, especially in cold conditions
  • No front filter threads on the slim frame, so you cannot stack additional filters on top of it
  • Premium pricing compared to thicker UV filters that offer similar UV-blocking performance
  • The thin metal ring may be more prone to cross-threading if not aligned carefully during installation

Frequently Asked Questions

At 3.3mm, the Cokin Pure Harmonie is one of the thinnest UV filters available, significantly slimmer than standard UV filters which typically measure 5-7mm. This ultra-slim profile is specifically designed to prevent vignetting on wide-angle lenses.
No. The filter is extremely lightweight and uses high-transmission glass, so it will not compromise or slow down your camera's autofocus system.
The EVERCLEAR 5 coating provides five layers of protection: it resists water, oil, dust, soil, and scratches, keeping the filter surface clean and making it easier to maintain in the field.
Yes, the 3.3mm ultra-slim profile was specifically designed to reduce vignetting issues even on extreme wide-angle lenses, making it well-suited for landscape and architectural photography.
The high-transmission glass and multi-coating are engineered to maximize light passage and minimize reflections, so the impact on image sharpness and exposure is negligible.