What size filters would you get for an RF kit?

If you were buying filters (ND, circular polarizer, etc) for your RF lenses, what  size filter thread would you get? Especially considering future lens purchases?

100mm square with a set of adapters.

If you get one large size, usually you can find a reducer that will work with smaller size lenses.

Texchappy wrote:

If you were buying filters (ND, circular polarizer, etc) for your RF lenses, what size filter thread would you get? Especially considering future lens purchases?

This question is highly dependent on the way you use your equipment and budget. If you are really going to buy the high-end L lenses the budget should not be that big an issue.

You might get better advice if you laid out what you are likely to buy and use and how much use the various filters.

Polarizing filters are a bit of a special case. How much do you use a circular polarizer? Generally, I would not use a circular polarizer or variable neutral density filter (top-notch ones have less of an X problem) with a very wide-angle lens (aka 14/15 to 35mm).

You could certainly go with the 82mm and then get a step-down ring for filters you might use but then they don't work with lens hoods (you can get an extra lens cap that would fit). I would only go with the step-down ring approach for filters you would rarely use but might want to use occasionally.

Personally, I mostly use ND filters for the purpose of using a slow shutter speed and I use fixed ones to avoid problems with polarization effects. I thought I could use a step-down ring but then decided the inability to use the hoods with them was too big a drawback.

I started with 82mm ones but then I also bought the 77mm version since it makes life so

much easier not having to use a step ring and have problems with the sunshade. With my L Lenses filter cost is not a deciding factor.

I wouldn't bother with lens filters, except maybe for the CPL.

I'd get clip filters. Since behind the lens means they fit on everything. And none of the normal issues with lens filters, from getting stuck to flares to messing with step up rings.

I use a couple different ones behind my RF lenses and love it.

I use Kolari ones. Their ND are particularly free of color cast, and it's especially important to me because I shoot IR. Not everyone is as picky. Great filters.

But STC makes some, and I think Kase does now as well.

I've still got tons of lens filters, but I sure wish I'd started out with clips instead so I didn't have so many.

https://kolarivision.com/product-category/lens-filters/rear-filters-lens-filters/

https://usa.stcoptics.com/collections/clip-filters

robgendreau wrote:

I wouldn't bother with lens filters, except maybe for the CPL.

I'd get clip filters. Since behind the lens means they fit on everything. And none of the normal issues with lens filters, from getting stuck to flares to messing with step up rings.

I use a couple different ones behind my RF lenses and love it.

I use Kolari ones. Their ND are particularly free of color cast, and it's especially important to me because I shoot IR. Not everyone is as picky. Great filters.

But STC makes some, and I think Kase does now as well.

I've still got tons of lens filters, but I sure wish I'd started out with clips instead so I didn't have so many.

https://kolarivision.com/product-category/lens-filters/rear-filters-lens-filters/

https://usa.stcoptics.com/collections/clip-filters

Interesting. I have never seen anything like that.

I buy filters to fit each lens that I have, Of my five RF lenses, only two take the same size anyway: 50mm and 16mm. I keep a UV filter on at all times to protect the lens. I consider this cheap insurance. I also use the circular polarizers, so find it economic to buy one of these kits.

David

I am not a professional but I decided on two sets.

58mm UV, 3 stop, and 6 stop fits the nifty 50mm f.8 and 35mm f1.8 with step up rings.

82mm UV, 3 stop and 6 stop for my 15-35mm f2.8 and later the 50mm f1.2 when funds allow

I am not doing video, so I opted not to buy a circular polarizer.

Surely it depends on the lenses you have, or intend to buy.  Many of the L lenses are 77mm, so that’s a good choice, and you can use a step down ring to adapt to 67mm for example.  If you are looking for slide-in 100mm filters (eg Lee or NISI neutral density), you buy one holder and the necessary adapter rings. 
For protection filters, if you use them, you would buy one for each lens, in the correct size.

Texchappy wrote:

If you were buying filters (ND, circular polarizer, etc) for your RF lenses, what size filter thread would you get? Especially considering future lens purchases?

I use protective filters on all my lenses - 14-35 + RF24-105L + 70-200Lf4. If something happens there is always a spare part in the bag (filter) and same pol filter is usable on all of them.

To me the 77mm size matters