I need to get me a polarizer that will be used on my RPPs, Red 300mm & the occasional odd lens (such as my old Angeneiux 25-250mm T3.9).
My matte box is usually the RedRock for which I obtained a 5.65x5.65 filter tray, and sometimes I use a smaller light-weight 2-stage Chrosziel 4x5.65.
Two part question:
1. Do I get linear or circular? I've long though of circular as superior, but recently I heard that circular is only needed if being used on a CCD system. Really? Don't you still need to be able to rotate? I'm confused. I also read David Mullen talking about Circ Pols sometimes causing artifacts in the sky on a pan. Whoa! Can Linears do this too?
2. Size: 4x5.65 or 5.65x5.65? I supposed this is related to part 1. If I get linear then I might as well only get 4x5.65 since I won't be rotating it.
It's odd to be coming into this problem now. I had previously solved this by having a 72mm screw-on circ pol that I used on my Red 18-50mm, nice and light, but now have different lenses.