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Drop-in circular polarising filter with adjustment dial, black finish

SIGMA

SIGMA RCP-21 Drop-In WR CPL Filter 300-600mm f/4 DG OS Sports L Mount

SKU CH-XTPT-0PV5C

A drop-in circular polariser with an adjustable dial to control reflections from glass or water and boost landscape contrast

  • Adjustable polarisation via built-in dial
  • Reduces glare from glass and water surfaces
  • Boosts landscape contrast for deeper skies
  • Drop-in design fits 300-600mm f/4 DG OS Sports
  • Weather-resistant construction for outdoor shooting

Sigma RCP-21 Drop-In CPL Filter

This drop-in circular polarising filter is designed for the Sigma 300-600mm f/4 DG OS Sports lens with L mount. It allows photographers to control polarisation effects directly on the lens barrel. The filter helps manage glare in bright outdoor conditions. It suits wildlife and sports shooters using this specific optic.

Adjustable Dial for Effect Control

The integrated dial lets you rotate the polarising element while the filter remains seated in the lens drop-in slot. This changes the intensity of reflection reduction on glass or water without removing the filter. You can also tune contrast enhancement for skies and foliage in real time. The mechanism keeps the filter secure during adjustment.

Compatibility Limited to 300-600mm f/4 DG OS

This filter fits only the Sigma 300-600mm f/4 DG OS Sports lens in L mount configuration. It will not fit other Sigma telephoto lenses or different mount versions of the same focal range. Buyers with other lenses cannot use this drop-in filter. Verify your exact lens model before purchase.

How it compares

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

Price $149.99
Pricier than about 90% of the 1,281 comparable items (median $48.99).

Specifications

No published specifications for this item yet.

Questions about this item

How often should I clean the dial mechanism on the RCP-21 filter?

Wipe the dial and filter surfaces with a microfibre cloth after each shoot to prevent grit buildup; no lubrication is required.

What happens if I rotate the dial past its end stops during long sessions?

The dial has hard stops at minimum and maximum polarisation; forcing it further can damage the internal gearing.

Does the filter add noticeable heat or power draw when used all day?

It is a passive optical element with no electronics, so it generates no heat and consumes no power.

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