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Hoya 0684 55mm HMC 81A Warming Filter — main product image
Hoya 0684 55mm HMC 81A Warming Filter
Hoya 0684 55mm HMC 81A Warming Filter
Hoya 0684 55mm HMC 81A Warming Filter
Hoya

Hoya 0684 55mm HMC 81A Warming Filter

★★★★★5.0 (1 reviews)

Add a touch of golden warmth to portraits and daylight shots with this optically multi-coated 55mm filter that corrects cool casts in-camera.

$14.95*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Hoya 55mm HMC 81A Warming Filter is a practical optical tool for photographers who want to build the look into the exposure rather than fix it in post. The 81A classification indicates a mired shift of +18 — enough to take the clinical edge off daylight frames, smooth out cool overcast light, and flatter skin tones in portrait sessions without pushing into heavy amber territory. It's a particularly natural fit for film photographers and those shooting with color-balanced sensors who prefer to dial in their palette at the time of capture.

Hoya's HMC (Haze Multi-Coating) treatment applies multiple anti-reflective layers to both glass surfaces, reducing flare and ghosting even when shooting toward windows or bright sky. At a 1.4x filter factor (about 0.5 stops), the exposure impact is minimal — automatic metering systems handle it without intervention. The 55mm thread screws securely onto compatible lenses, and the filter's slim profile keeps vignetting risk low on standard and short telephoto focal lengths. It's a simple addition to any kit that consistently earns its keep across portrait, lifestyle, and golden-hour landscape work.

Key Features

Light balancing filter used to decrease the color temperature slightly for a warmer (redder) tone

Multi-coated filter minimises reflection at the filter surface, reducing flare and ghosting

Recommended for enhancing the performance of multicoated lenses

To fit 72 mm thread size

Specifications

Filter Size
55mm
Filter Type
Warming (81A)
Material
Optical Glass
Coating
HMC (Multi-Coated)
Mired Shift Value
+18
Filter Factor
1.4x (0.5 stop)

Pros & Cons

👍 Pros

  • Delivers a consistent, subtle warm shift that flatters skin tones in portrait sessions without any post-production color work
  • Multi-coating visibly suppresses flare when shooting toward windows or open sky — clean results even in backlit conditions
  • Optical glass construction preserves detail and color fidelity across the full frame
  • The mired shift value of +18 is gentle enough to use as a default daylight filter without overcooking neutral scenes
  • Slim 55mm threading screws cleanly onto a wide range of standard and portrait lenses without adapter rings

👎 Cons

  • Works in only one direction — adds warmth but is useless when you need to cool a shot under tungsten or mixed artificial light
  • The 0.5-stop exposure penalty can be inconvenient in fast-paced or low-light scenarios where every stop matters
  • Effect intensity is fixed — digital white balance adjustments offer infinitely more nuance and zero optical compromise
  • The 55mm thread diameter means it only fits lenses with that exact size; no universal adapter is included
  • In bright, warm-toned scenes, the filter can push golden-hour light into oversaturated territory if not used with restraint

Frequently Asked Questions

It adds a gentle warm cast by shifting color temperature slightly — ideal for flattering skin tones in portraits, softening overcast light, or lending a subtle analog warmth to landscapes without touching a post-processing slider.
No noticeable impact. The HMC multi-coating reduces flare and ghosting at the filter surface, and the optical glass maintains color fidelity and detail. Expect clean results from edge to edge.
It carries a filter factor of 1.4x — approximately 0.5 stops. Most metering systems compensate automatically; in manual mode you'll need a slight exposure bump.
Yes — Hoya specifically recommends HMC filters for use with multi-coated lenses. The filter's own coatings are engineered to complement, not conflict with, the coatings on your glass.
Technically yes, but stacking filters increases the risk of vignetting, particularly on wider focal lengths. If you stack, use thin-profile filters to minimize that risk.

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