Drop-in Filter Mount Adapter EF-EOS R compatibility with RF lenses

[MDumas1974Canon]

Hello and good morning Canon Community, I have a simple question that I am having a hard time getting answered, and I think I already know the answer to it. I want to purchase the Variable ND drop in adapter for my Canon R, However I currently own several expensive RF lenses and currently no EF lenses so my question is, with the adapter on can I still connect my RF lenses to my R thus utilizing the ND filters, as well as the Circular Poliarizer? I would greatly appreciate it if anyone has a for sure answer on this, I simply want to know if I can put the adapter on my Canon R and connect my RF lenses to the adapter? Thank you for your time in reading this and I hope someone knows, if you cant that is a tragedy. From everything I have read it is an amazing system and I definitely would love to use it, especially on lenses with concave glass where you are unable to use ND filters...etc

[p4pictures]

The RF mount and lenses are designed to be a certain distance from the sensor, if you put a bigger space between them then you loose the ability to focus on infinity. As such it is not going to be possible to make a rear mounted filter adapter for the RF lenses on EOS R-series cameras.

Older EF and EF-S lenses were mounted further from the sensor - to allow the mirror space to flip up out of the way - and this space needs to be added between the back of the EF/EF-S lenses and the RF mount on an R-series camera. Canon took the option to make a number of adapters that allow filters to be used in that space, hence the circular polariser and variable ND filter adapters exist for EF/EF-S lenses only.

[MarkASteele]

Now that makes sense.  Not the answer I wanted, but woe is me. Thanks for that reply, it explains the reasoning very well.  Now...on to other options.

[rs-eos]

Agreed that no rear-mounted filter will show up.  The only gear to date that has built-in ND filters is the EOS C70.  Presumably the Cinema 300 and 500 updates that will have an RF mount will have the same.

[MarkASteele]

no, I'm looking for that same product, but RF to RF.  In other words, I want that product for my CanonR5 for use with RF lenses.  That is only for the RF body to older EOS mount lenses.

[shadowsports]

Hi Everyone,

The RF 10-20 has a built in gel holder.  Only one I'm aware of currently.  There may be others?? (but I don't recall seeing any).