Hello,
I need to use a polarizer for an upcoming water shoot. My EX1 lives with it's IR filter on. Should I stack the filters or drop the IR when using the polarizer? Thanks!

As a rule the less glass in front of the lens the better.I take my IR off if I require another type of filter.

Ditto, I don't have the IR on unless I need it.

When would you not want an IR on? I guess I shoot a lot of people with black shirts, but I never take it off.

I can film most jobs without it, and unless there's a situation where there are multiple black and the colours are all different I'll leave it off. It loses light too, over a stop I expect.

We shoot in a clothing store a couple of times a month with mixed lighting. Roof fluorescent, some daylight, Arri MSRs and Coollights LEDs and fluorescents.

We watch every shot while setting up, occasionally there's a black fabric that causes the IR problem, but it's quite luckily rare. And it always seems the MSRs are the source which makes it worse, probably because they have such a high CRI whereas the Coollights stuff has less red at source.

When would you not want an IR on? I guess I shoot a lot of people with black shirts, but I never take it off.

It's only blacks where man made fibres are used. It's important to have the IR filter to hand but I only put it on when I need it.

I do however leave a UV filter on at all times (except if I am using another filter). I'd rather scratch or damage that than the EX1 glass.

Marcus - what UV filter do you use?
thanks, Malcolm

Marcus - what UV filter do you use?
thanks, Malcolm

It's a Tiffen.

Thanks very much. I think I'd better get one (it was on my wishlist, but I'd forgotten until I saw this thread).
Regards, Malcolm

You'd be amazed how much crap collects on the UV filter. When you keep in mind that all this would be going onto your expensive lens it's a no-brainer.

But you do need to keep it clean. Very clean. Also watch out for reflections when there are bright light sources.