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Canon Drop-In Filter Mount Adapter EF-EOS R with Circular Polarizer Filter

BH #CAMAEFRFDICP • MFR #3442C002
70 reviews
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Canon Drop-In Filter Mount Adapter EF-EOS R with Circular Polarizer Filter
Key Features
  • Canon EF/EF-S Lens to EOS R Camera
  • Maintains AF and Image Stabilization
  • Includes Drop-In Circular Polarizer A
  • Dust- and Water-Resistant
Extending the range of compatible lenses, this Canon Drop-In Filter Mount Adapter EF-EOS R is a unique lens adapter designed for attaching any EF or EF-S-mount lens to the EOS R mirrorless digital camera. This sophisticated adapter affords compatibility with select A-type drop-in filters, and includes a circular polarizer filter to help increase saturation and contrast and reduce reflections.
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Canon 3442C002 Overview

Extending the range of compatible lenses, this Canon Drop-In Filter Mount Adapter EF-EOS R is a unique lens adapter designed for attaching any EF or EF-S-mount lens to the EOS R mirrorless digital camera. This sophisticated adapter affords compatibility with select A-type drop-in filters, and includes a circular polarizer filter to help increase saturation and contrast and reduce reflections.

The adapter's design extends the ability to use filters with unique lenses that cannot accept filters on the front, and and it also retains full autofocus and image stabilization capabilities of the mounted lens. It is also dust- and water-resistant, making it suitable for use in harsh weather conditions.

UPC: 013803318005

Canon 3442C002 Specs

Item Type
1x Lens Mount Adapter with Drop-In Filter Support (Circular Polarizer Included)
Camera Compatibility
Canon RF Mount
Lens Compatibility
Canon EF/EF-S Mount
Electronic Communication
Yes
Included Shims
Materials
Metal
Dimensions
Diameter: 2.9" / 73.66 mm
Depth: 1" / 25.4 mm
Weight
4.27 oz / 121 g
Packaging Info
Package Weight
0.65 lb
Box Dimensions (LxWxH)
5 x 5 x 5"

Canon 3442C002 Reviews

Can't live without it!

By Keylan
Rated 5 out of 5
Date: 2026-05-05

I absolutely LOVE this adapter. It is honestly one of the main reasons that I still use EF glass. It's the only way to use the 11-24 with polarization which is vital for my work. I do wish It came with a clear filter in order to maintain usability when removing the polarization.

Eliminates the need for Polarizer Filter

By Nicolas
Rated 5 out of 5
Date: 2024-11-10

Great EOS adapter that allows applying a circular polarizer for EF lenses. Works well, even with the EF 11-24

See any errors on this page?

Will this work with the RP

Will this work with the RP
Asked by: Joseph L.
Yes it will. This will work with the Canon EOS RP as well.
Answered by: Joe P
Date published: 2020-03-27

Is there a case for the drop-in filter when not ...

Is there a case for the drop-in filter when not in use?
Asked by: Daniel
The filter that comes with the adapter does not come with its own case.
Answered by: Rob
Date published: 2021-02-18

Once the polarizer or ND filter is removed do you ...

Once the polarizer or ND filter is removed do you have to put a clear filter in it's place is okay without a filter?
Asked by: alan
Yes, once you remove the polarizer or ND filter, you have to put a clear filter (BH #CADICFA • MFR #3444C001) in it's place.
Answered by: Samik G
Date published: 2023-04-05

Will this work with full frame cameras, ...

Will this work with full frame cameras, specifically red v raptor?
Asked by: colton
The Canon Drop-In Filter Mount Adapter EF-EOS R with Circular Polarizer Filter is designed for Canon RF cameras with a full-frame (36x24mm) sensor. The sensor of the Red V-Raptor is 40.96x21mm, so it may not fully cover the sensor when shooting 8K.
Answered by: Boyd H
Date published: 2022-09-12

The directions for the adapter say it has to be ...

The directions for the adapter say it has to be removed from the camera before I can change lenses. Why? It seems that it would be easier to leave the adapter on the camera and just change the lens attached to the adapter.
Asked by: Mary
We have all 3 adapters and 11 lenses and swap them out all the time without removing the lenses, never have had an issue,
Answered by: Thomas
Date published: 2021-08-27

Description says "water-resistant". How ...

Description says "water-resistant". How water-resistant is the dial that you turn to rotate the circular polarizer? Usable in rain?
Asked by: Yinan
Why in the heck would you think this would be good in the rain? There's not a possibility I would ever put this holder on in the rain. Yes it's good for misty conditions but not like prime lenses. I would not recommend using in rain or high moisture conditions.
Answered by: Bill
Date published: 2021-10-12

I am more concerning the image quality and ...

I am more concerning the image quality and autofocus speed when using polarizer filter. Does it degrade the image quality of the captured image? Does it slow down the autofocus speed at all?
Asked by: Rong
It works well , does not change the auto focus speed and does not degrade the image quality
Answered by: vilson
Date published: 2021-02-18

Is there a filter adapter for use with the RF ...

Is there a filter adapter for use with the RF lenses? Or does this allow both EF and RF lenses?
Asked by: Richard
No there is no RF to RF adapter
Answered by: vilson
Date published: 2021-02-09
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