Filter Question re RF 15-35mm f/2.8 L

[Wandalynn]

I am one of those people who likes to use a protective filter on my lenses, especially for a lens with a hood that doesn't offer much protection, like the RF 15-35. So, do I need an ultra-thin filter (vs. regular thickness) for my 15-35 in order to avoid seeing the filter frame in the picture at 15mm? I really like B+W (clear) filters but they don't make ultra-thin.

[kvbarkley · Accepted solution]

According to Ken Rockwell, there is no need for thin filters:

https://kenrockwell.com/canon/eos-r/lenses/15-35mm-f28.htm

Scroll way down the page.

[shadowsports]

Greetings,

I have a clear filter on my 15-35, I use standard Bower, Tiffen or B&W. I don't see any frame at 15mm. 👍

[AtticusLake]

I think you're fine for the 15-35. I have that lens, with a Freewell magnetic filter holder. I stacked a CPL AND an ND on there (which isn't even a real combination), and on the R5, in stills mode, using the full sensor, got no vignetting at F/2.8 or F/22. In fact sticking my finger in from the edge of the lens, there even seemed to be a decent bit of spare room.

Other lenses may vary, though.

[Wandalynn]

Thank you all for your quick and helpful responses! I'll go ahead and order my usual type of filter.

[Waddizzle]

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@Wandalynnwrote:

Thank you all for your quick and helpful responses! I'll go ahead and order my usual type of filter.

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Do not order a UV filter. There is a UV filter layer built into the image sensor assembly.

I use B+W Clear Nano filters to keep my front element clean, not for protection against impacts.

[Wandalynn]

Thanks for the heads-up. I stopped using UV filters several years ago, switching to the clear ones. I also prefer those B+W Clear Nano filters, which is what I ordered this morning from Adorama. They are very nice. My only lens that I can't put a protective filter on is my EF 8-15mm fisheye. So, I'm extremely careful about what I expose it to and always replace the cap after each shot.