polarizer options for Cokin Z holder?

I'm considering getting the Cokin Z-Pro filter holder and Hitech ND filters (http://www.2filter.com​/prices/Hitech_Z_packa​ge.html). Seems like a good choice that will allow a lot of flexibility to use with varying sized lenses.

My question: if I want to use a circular polarizer in the Z-Pro holder, what should I get? The only viable choice I can see is a 100mm screw-in polarizer that would fir into the holder, but not too many choices out there with that size. Am I missing something obvious?

Thanks.

Any recommendations or ideas? Is this just not a common type of setup? What is everyone else doing for polarizers - is it better to buy a different screw-in circular polarizer for each lens size?

I got the cokin CPL (the one that works with the P holder) and quite honestly. I don't like it. It doens't turn well in the holder and seems like a pain to use. I would recommend getting a CPL that fits onto your lens. Then screw the adaptor into the CPL and since both units freely rotate, it should be easy to use.

Thanks for the reply wonny. I originally started looking into Cokin-type holders to allow sharing solid ND's across all my lenses, but I just did a side-by-side cost comparison and I'll probably go with traditional screw-in filters with step-up rings.

bminnie: I'm looking at the same ND set as you, but I already have my circ polariser. I asked the same question of the saleslady at 2filter and she recommended the same as what wonny said. This is what she told me:
-Screw on your circ polariser and rotate it to achieve the desired affect.
-Attach (I think this was the word) the adapter ring
-Attach the holder over the adapter ring
-Slide in ND filter and find your desired affect again.

She gave me the impression that it was quite difficult to adjust the polariser once everything was put together. If anyone disagrees with this, please let me know!

Also, when you go to buy your circ polariser, remember if you are using an ultra-wide lens, it's not a bad idea to get a thin circ polariser to avoid vignetting.

I have been pondering the Z Pro set up for some time. What stopped me was the price (and so-so reputation) of the Cokin CPL. I have since purchased a hi-end Hoya CPL. When I purchase the Z Pro system, if I need to combine the two, I will just attach the CPL to the lens as suggested by Keenasmustard and put the Z Pro over it. I expect it to be hard to control, as Keen was told - but it should not be any more difficult that controllng the Cokin CPL staked with the other filters.

Any issues with having the srew-in CPL last in line to the lens? In other words, if you attach the CPL and then put the Z-Pro holder in front of it, does the order matter much? I've heard CPL should be the first element but wionder why? I've seen many other posts on that particular topic, will need to search...

This picture - from the 2filter.com website - shows the Zpro set up with the Cokin CPL mounted closest to the lens - with the empty slots for additional filters further from the lens. I have been told that this is the desired order. Hope this helps you:

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