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Thin circular CPL filter with black magnalium rim and clear Schott B270 glass

Gobe

Gobe 3Peak 40.5mm SCHOTT B270 16-Layer MRC CPL Filter

SKU CH-4ZBM-N2RTA

A 40.5mm circular polariser with SCHOTT B270 glass, 16-layer MRC coating and 99.9% polarization rate cuts glare and boosts saturation by 1.2-1.5 stops

  • Reduces glare with 99.9% polarization rate
  • Enhances colour saturation via SCHOTT B270 glass
  • Resists scratches and water with 16-layer MRC coating
  • Minimises vignetting through low-profile 40.5mm magnalium rim
  • Adjusts exposure 1.2–1.5 stops via 2.3–2.8 filter factor

Gobe 3Peak 40.5mm CPL Filter

This circular polarising filter fits lenses with a 40.5mm thread and uses SCHOTT B270 optical glass. It is built for photographers who need to cut glare and boost saturation in harsh outdoor conditions. The Magnalium alloy rim keeps the profile low to reduce vignetting on wide-angle lenses.

Sustained outdoor performance

The filter withstands salty water, extreme wind, dust and abrasive elements without degradation. Its 99.9% polarization rate maintains superb anti-reflection capabilities throughout long shoots. Rotating the ring lets you dial the exact angle to absorb diffused light as the sun moves across the sky.

Light transmission and handling

The 16-layer MRC multi-resistant coating protects the glass while preserving color balance. Filter factor ranges from 2.3 to 2.8, equivalent to 1.2 to 1.5 stops of light reduction depending on rotation. The slim rim design prevents corner darkening on wider focal lengths.

How it compares

Measured against everything we stock in Lens Filters & Polarizers, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 86% of the 1,281 comparable items (median $48.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does the 16-layer MRC coating on the 40.5mm SCHOTT B270 glass cause any noticeable heat build-up during long daylight shoots?

The 16-layer multi-resistant coating on SCHOTT B270 glass is passive and does not generate heat; it only transmits or blocks light, so the filter itself adds no thermal load during all-day use.

What thread size must my lens already have for the 40.5mm CPL to screw on directly?

Your lens needs a 40.5mm front filter thread; the filter mounts directly on that thread without an adapter ring.

Will the 2.3–2.8 filter factor (1.2–1.5 stops) require exposure compensation when I keep my older manual-exposure camera?

Yes, rotate the CPL to the desired effect and then open the aperture or slow the shutter by roughly 1.2 to 1.5 stops to compensate for the light loss indicated by the 2.3–2.8 factor.

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