One of my favorite accessories that debuted with the new mirrorless Canon cameras is the EF-EOS R Drop-In Filter Mount Adapter. This mount adapter allows Canon EF lenses to attach onto the RF mount, but also adds a variable neutral density or circular polarizer into the mix in one product.
For this video, Potato Jet takes a spin with the Canon EF-EOS R Drop-In Filter Mount Adapter and gives his thoughts on its design and performance. The variable neutral density filter is controlled with a small dial on the side of the mount adapter and is capable of blocking 1.5 to 9 stops of light. Canon also makes a circular polarizer version which operates the same way, allowing for variable strength of polarization.
The biggest downside with the Drop-In Filter Mount Adapter is that it does not come with any way to remove the effects filter and close the gap in the adapter. Instead, a separate $129.95 purchase is required to buy the clear drop-in filter. As with the clear drop-in filter, the variable neutral density and circular polarizer drop-ins are available as add-ons as well.
Do you own the drop-in filter adapter? Share your experience in the comments below.
I love the idea (especially considering this can let you filter with lenses that don't have any other reasonable options) but the price seems a bit out of touch for me, especially for the clear drop in filter.
canon should include one with every RP.
For $99 you have an adapter with no filter that is also much more durable than the insert in a bag.... just get a plain ef-rf adapter. This is why I have both.
The killer video feature for sure. Makes you wonder what they have planned for bodies down the road
I went for the adapter with the polarizer. Love it. One filter from 8-600mm. Plus I don’t have to turn the camera off to change the lenses with the curtain closed. The filter prevents any dust from getting to the sensor
I have the ND filter and it has a horrible brown cast on the bottom right and top left corner, wish I never bought it.
Does turning the filter have a hard stop to it? This is the effect you see with variable ND filters that don’t have a hard stop and are spun too far beyond the limits. If it does have a hard stop, I’m wondering if there was a manufacturing error with yours where the two pieces of glass weren’t aligned correctly?
The drop-in ND filter do have max-min stops.
So now I have tested the filter on my EOS R. I does have a quite pronounced blue color shift close to and at max bit is is consistent over the whole frame. So nothing like your picture.
Using a camera/lens calibraion tool and white balancing is recomended to get accurate colors.
A pre and post color and white balance correction. There is a 1-stop difference between each picture from Min to Max
If you do by an additional drop-in filter separate it does come with a plastic case.
If someone makes a sheath/sleeve type case for the filter inserts, so that you can slide it out of the adapter and slide it into the sleeve —*click*—they’d make bank I reckon.
Having to open the clunky case that comes with the spare adapter every time you want to swap them out is ridiculous. Especially considering the filters already have a simple click-secure mechanism that could easily be used to store them as well.
Ultimately I’d want a sleeve that can attach to the outside of my camera bag, so I could swap them out easily on the fly. For documentary work it’s important to be able to adapt to any situation in a hurry.