Singh-Ray polarizers for Cokin P, ring or sprocket mount?

I made a similar thread in Nature & Landscapes Talk but haven't got any replies yet, and this subforum seem to have more traffic...

Anyway, I recently bought a set of Singh-Ray ND grads for use with Cokin P, of which I have both the wide-angle and standard holders. I originally wanted to use a screw-in circular polarizer on the lens and then mount the holder to the filter, but found it was a bit of hassle turning the polarizer while trying to keep the holder stationary. I'm therefore looking into getting a polarizer from SR for use with the grads, I'm thinking either a LB Warming or Color Combo, and maybe a Gold'n'Blue.

My question is, for those who've used this system, if it's better to get the sprocket rather than ring mount? I will probably use the polarizers in combination with the grads for the most part, and I guess I could just handhold the grads, but I might want to use the polarizer + two grads on the standard P holder. As for the wide holder, would mounting a sprocket polarizer result in the filter edges being visible on 17mm on FF? I'm using a 5D II with a 17-40, and the holder itself doesn't vignette @17mm.

Also, if anyone who've used the SR LB Warming/Color Combo, I'd love to see some shots with/without the filter if you happen to have some.

Cheers!

No one has any opinions on sprocket type polarizers?

I use sprocket mount SR LB warming polarizer on the Lee kit. Tried it out recently - worked well. I put it in the closest slot (to lens) and grad ND in the 3rd spot (second spot is not usable with the sprocket mount in the first spot) - no vignetting with the 17-40 at 17 on 5DII.

Nice to hear there's no vignetting, but kind of a bummer if you can only use one grad together with the polarizer. Wonder if it applies to the Cokin holder as well? The Lee kit is larger than Cokin P though, equivalent to Cokin Z-Pro, or have I misunderstood?

Right - the Cokin P filters are only 85 mm; the Z-Pro and Lee are 100 mm (4"), so less vignetting especially at wide angles and with round filters in the equation.

Thanks for clearing that up. I guess that means vignetting could be present with the P sized filters.

Correct - Lee is Z-pro equivalent.

I have not tried it, and not sure it will work, but you could put the sprocket mount polarizer in the 3rd spot and use the first 2 for square filters.

FWIW, the setup I mentioned first is what Darwin Wiggett uses and recommends...

koffikapp wrote in post #14787215
Nice to hear there's no vignetting, but kind of a bummer if you can only use one grad together with the polarizer. Wonder if it applies to the Cokin holder as well? The Lee kit is larger than Cokin P though, equivalent to Cokin Z-Pro, or have I misunderstood?