I see.. I've known about these but never used one.. I'm not quite sure if it'll fit into my shooting style.
It's worth checking out though..!
This thread may be helpful...
sunny days, no grads, sounds like velvia isn't your shooting style. I shoot a lot of it but almost never shoot it in direct sun, the film just isn't capable of handling that contrast ratio if you're looking for professional results. And pull processing without color shifts, GOOD LUCK!
Reducing Velvia's contrast though reduces the effect that Velvia sets out in the first place, using contrast and palette to deliver punch, in lighting matched to the design parameters of the film. The heavy contrast and touchy latitude can be too much for some people, but like everything, you get better with it with lots of experience! Provia 100 is a good, lower contrast alternative but a pastier palette. Experimentally, GNDs with multi-patter/evaluative metering systems can confuse the reading. Run tests specific to your camera before committing a GND to an important shoo.
Velvia can work great in full sun, you just have to be sure to expose using the Sunny-16 rule instead of your meter and make sure there is nothing deeply-shadowed in your scene. At Sunny-16 with a CPL, you will get deep dark skies, perfect foreground-exposure and nicely-exposed bright-but-not-blown clouds, it all comes together quite well.
OTOH, Fuji says it's fine to pull-process it by one stop by reducing the duration of first-developer. You could certainly reduce contrast that way though it might have an effect on saturation.
Transparency material doesn't have great latitude. I used to shoot 4x5 transparency material for commercial work and I had to proof it all with Polaroid. Luckily, I used studio lights where I can fill dark shadows and used flags to gobo off hot spots. I'd rather work with neg film. Doing photography shows what great latitude our eyes have.
What!? A polariser in bright sun for Velvia!? Come off the glue.
No actually, using a polarizer in bright sun makes a lot of sense. Properly used, the polarizer will bring down the brightness of the sky (sort of) like a graduated ND filter. This makes your meter think there's less light, so it increases the exposure. This makes the shadows less dark. Bringing down the brightness of the sky is reducing contrast of the scene, and since we know how contrasty Velvia 50 is, it should allow a bit more shadow detail without completely blowing out the sky.