Neewer

Neewer NW Series S 40.5mm CPL Polarizing Filter

4.5 (222 reviews)

Cut glare, punch up contrast, and pull saturated skies from flat midday light with this slim 40.5mm CPL.

$17.99*
Check availability

*Price sourced from Amazon.com. Last updated:Jul 15, 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

Slipping a CPL onto your lens transforms ordinary daylight photography — pulling deep blues back into washed-out skies, killing the silvery sheen off water, and letting foliage pop with genuine saturation rather than the blown highlights that haunt unfiltered outdoor work. The Neewer NW Series 40.5mm CPL is built for mirrorless shooters whose compact lenses require that smaller, less common thread size, bringing multi-layer polarizing glass to a size category that often gets overlooked by premium filter brands. Whether you're shooting landscapes, environmental portraits near windows, or product photography fighting reflections on glassy surfaces, the polarizing effect here is real and controllable.

The filter is constructed with an aluminum alloy frame finished with CNC precision knurling — it threads on securely, rotates smoothly, and doesn't develop the loose wobble cheaper filters show after a season of use. The 24-layer nano coating is the practical workhorse of the design: water beads, fingerprints wipe clean in one pass, and the glass stays optically clear session after session. The included hard case and cleaning cloth round out a kit that's actually ready to work right out of the box. For 40.5mm lens owners who've been making do with a bare glass front element, this is an easy, affordable upgrade that visibly improves outdoor image quality from the first frame.

Key Features

【Natural Color Enhancement】 NEEWER CPL Filter significantly improves contrast and saturation, delivering amazing photos with rich colors and fine details

【HD Visual Experiences & Low Light Reflectance】 Featuring the premium HD optical glass with multiple layers of polarizing films, this CPL filter minimizes the light reflectance to less than 0.1%, reducing flare and ghosting for a high definition visual experience

【Multi Resistant Nano Coatings】 The multi layer Nano coatings on both sides of the filter effectively protect against water, dust, oil, fingerprint, and scratches, easy to clean with just one wipe

【Ultra Slim Frame & Smooth Rotation】The ultra slim yet sturdy aluminium alloy frame with the advanced CNC precision treatment enables effortless installation, and straight knurls ensure smooth rotation for achieving the best effects

【What You Get】Includes 1 x 40.5mm CPL Filter, 1 x Cleaning Cloth, 1 x Filter Case. Note that this 37mm camera filter is compatible with 37mm lenses. The thread size is marked on the front or side of your lens, next to a "ø"(diameter) symbol. Please verify the thread sizes before purchasing the filter

Specifications

Filter Size
40.5mm
Glass
HD Optical Glass
Coating
24-Layer Multi-Resistant Nano Coating
Effect
Circular Polarizing (CPL)
Light Reflectance
Less than 0.1%
Frame Material
Aluminum Alloy (CNC precision treated)
Includes
Filter, Cleaning Cloth, Filter Case

Pros & Cons

👍 Pros

  • Nano coating sheds water and oil quickly — you can wipe and shoot without smearing during outdoor sessions.
  • The slim frame drops onto small mirrorless lenses cleanly without the added bulk that causes vignetting on wider focal lengths.
  • Below 0.1% light reflectance means flare and ghosting are genuinely suppressed, not just marketed away — glass surfaces stay clean in backlit scenes.
  • Smooth knurled rotation lets you dial polarization precisely without accidentally nudging your focus ring on manual lenses.
  • The included hard case keeps the filter protected in a bag pocket without scratching other glass.

👎 Cons

  • 40.5mm is a less common filter thread size — stacking or sharing with larger lenses requires step-up rings not included in the kit.
  • At 2 stops of light loss, shooting polarized in shade or overcast conditions will push ISO higher than you'd want on a small-sensor camera.
  • The slim frame, while vignette-friendly, offers less grip surface than a standard-depth filter ring — trickier to unthread with cold hands.
  • No front threads for stacking additional filters — this is a single-filter solution only.

Frequently Asked Questions

The ultra-slim aluminum alloy frame is specifically designed to minimize vignetting risk, but on very wide lenses (below ~24mm equivalent) some corner darkening is possible — test at your widest aperture before a critical shoot.
Yes — a CPL typically costs 1.5 to 2 stops of light. Dial in exposure compensation or let your camera's metering adjust. The multi-layer polarizing film keeps reflectance below 0.1%, so you're losing stops to polarization, not to poor glass quality.
Rotate the outer ring while looking through your viewfinder or live view. The effect peaks when you're shooting at roughly 90 degrees to the sun. Watch the sky or reflective surface darken as you turn — stop when the effect is strongest for your shot.
The 24-layer nano coating handles water beading, dust, and fingerprints well in the field. A single wipe with the included microfiber cloth clears most contamination. Avoid abrasive cloths and you'll maintain coating integrity long-term.
40.5mm fits lenses with that filter thread diameter, typically found on compact mirrorless kit lenses (some Sony E-mount and Micro Four Thirds options). Check the front of your lens barrel for the ø symbol followed by the diameter before ordering.