Designed for use with the Canon Drop-In Filter Mount Adapter EF-EOS R, this Drop-In Clear Filter A is a simple clear protective filter used to guard the interior of the camera body and rear element of the lens when the lens adapter is in use. It is primarily used when the Drop-In Filter Mount Adapter is in place, but no filter effects are desired.
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Like many long time Canon owners (since 1971 for me) we have all accumulated a significant amount of EF glass. To provide an affordable transition to RF glass I found the EF to RF adapter a necessity. I purchased the Canon Drop-In Filter Mount Adapter with Variable ND Filter for use with my Canon R5. As a lower cost alternative to the Canon C70 and using the EF 24-70 F/2.8 II, the ND filter became a good combination. When recording either indoors or under low light the ND filter had to be replaced with a clear A drop in filter. Weight and space is always a concern when traveling and this appeared to be the best alternative for run and gun situations. My only complaint is the cost. It seems that $65 would be more reasonable price for a clear filter and frame.
I'm not convinced these seal flawlessly. in terms of keeping out dust when installed. But it seems to be fine. I prefer using this instead of changing the entire mount out when not in need of a drop-in Pola or ND.