One of the most annoying aspects of using front-mounted circular filters is that there are many different common sizes, which can quickly add up in cost and make you carry around a bag with a bunch of different filters. Canon's unique Drop-In Filter EF-EOS R Mount Adapter solves that issue, allowing you to use a single ND or polarizing filter with any EF lens. This excellent video review takes a look at how it holds up in the real world.
Coming to you from Deaf Director, this great video review takes a look at the Canon Drop-In Filter EF-EOS R Mount Adapter. This adapter is quite neat, as a lot of Canon users who have switched to the RF mirrorless system still use large libraries of EF lenses via adapters. Autofocus performance via such adapters has generally been quite strong or even above that of a DSLR, but the drop-in adapter takes it a step further, allowing the ability to put a polarizing or variable ND filter in between the lens and the body, making it both far easier and more cost-effective if you have a variety of lenses that require different filter sizes. Check out the video above for the full rundown.