Hoya HPUX405 UX Circular Polarizing Filter 40mm — main product image

Hoya HPUX405 UX Circular Polarizing Filter 40mm

Hoya

Hoya HPUX405 UX Circular Polarizing Filter 40mm

Name: Hoya HPUX405 UX Circular Polarizing Filter 40mm
Brand: Hoya
SKU: HPUX405

★★★★★4.4 (243 reviews)

Slim-frame 40.5mm circular polarizer that cuts glare and deepens color saturation without vignetting on wide-angle lenses.

$24.90*

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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 UX Circular Polarizing Filter (40.5mm) is designed to manage reflections from non-metallic surfaces such as water, glass, and foliage while simultaneously boosting colour saturation and contrast. This makes it a practical tool for landscape, outdoor, and architectural photography where unwanted glare can flatten an image. The rotating frame gives photographers direct control over the intensity of the polarizing effect, allowing you to preview and fine-tune the result in real time through the viewfinder or on your camera's LCD.

A key design consideration is the slim filter frame, which is engineered to minimise vignetting when used on wide-angle lenses—a common issue with standard-thickness polarizers. Despite the reduced profile, the frame still accommodates a standard lens cap, so there is no need to remove the filter for storage or transport. The water-repellent coating adds a layer of practicality for shooting in damp conditions, making it easier to clear water droplets and maintain a clean optical surface during outdoor sessions.

Key Features

Controls reflections from non-metallic surfaces such as water, glass, leaves and blue skies

Increases saturation and improves contrast

Rotating frame controls polarising effect

Slim filter frame - avoids vignetting on wide angle lenses whilst still holding a lens cap

Specifications

Brand

Hoya

Model

HPUX405

Filter Diameter

40.5 mm

Filter Type

Circular Polarizing

Frame Design

Slim (wide-angle compatible)

Coating

Water-repellent

Pros & Cons

👍 Pros

Slim frame design prevents vignetting even on wide-angle lenses while still accepting a lens cap
Water-repellent coating helps keep the filter surface clean and reduces water spot issues in the field
Rotating ring allows precise, stepless control of the polarizing effect strength
Effective at reducing reflections from non-metallic surfaces like water, glass, and foliage

👎 Cons

Reduces light transmission by approximately 1–2 stops, requiring exposure compensation in low-light situations
The 40.5mm diameter fits a limited number of lenses, so it cannot be shared across most lens collections without step-up rings
Slim frame design can make it more difficult to grip and rotate compared to thicker filter frames
No multi-coating mentioned, so flare resistance may be lower than premium-tier polarizing filters

Frequently Asked Questions

Will this filter cause vignetting on wide-angle lenses?

No. The Hoya UX polarizer uses a slim filter frame specifically designed to avoid vignetting on wide-angle lenses while still allowing a standard lens cap to be attached.

How do I adjust the strength of the polarizing effect?

Rotate the outer ring of the filter while looking through your viewfinder or at your live view screen. The polarizing effect changes as you turn it, letting you dial in the exact amount of reflection control you need.

Does the 40.5mm size refer to the filter diameter or the lens focal length?

It refers to the filter thread diameter. Check the front of your lens or its specifications to confirm your lens uses a 40.5mm filter thread before purchasing.

Does this filter have a water-repellent coating?

Yes, the Hoya UX Circular Polarizing Filter includes a water-repellent coating that helps keep the glass surface clean and makes water droplets easier to wipe away.