What is the difference between the various types of filters offered by B+W? The XS-Pro vs the F-Pro.. etc. I don't see on the Schneider Optics page a comparison of the details of each. I found a thread online that claimed the F-Pro was made of brass whereas the XS-Pro wasn't, but according to Amazon et. al. the XS-Pro is indeed made of brass.
I ask because between this thread, and this thread, I've gotten recommendations to go down the B+W route for filters. I'm just confused though between their F-Pro, and XS-Pro filters, and any other types. Did I miss on the Schneider Optics site where they explain the differences?
I've learned through these two threads that I should pass on UV filters and just get coated clear filters for protection. I'll also be getting a polarizer that I can use hopefully on both the 24-105 and the 70-200 given that they both take 77mm. I'm unsure though if that will work since the 24-105 goes down below 35mm and I've heard that below 35mm FL, you need a thin polarizer (or alternatively you shouldn't use one at all).
Any help will be appreciated. I'm going to post this on the other thread too since I've inadvertently scattered my questions across 2 threads.
B+W 77mm XS-Pro Clear MRC-Nano 007 Filter http://www.bhphotovideo.com/c/product/756818-REG/B_W_66_1066111_77mm_XS_Pro_NANO_Clear.html
B+W 77mm Kaesemann XS-Pro Circular Polarizer MRC Nano Filter http://www.bhphotovideo.com/c/product/752975-REG/B_W_1066400_77mm_XS_Pro_Digital_MC.html
XS-Pro = Slim filter with added threads for lens cap/addt'l filters, less light falloff with some lenses than a thick filter
Clear = Neutral, exactly what you want from a protective filter (unlike UV, which can affect color balance adversely)
MRC = Multicoated, better scratch protection and flare resistance than cheaper single coated filters
Nano = Coating that makes filter much easier to clean (almost like Rain-X, water/debris comes right off instead of requiring polishing)
The B+W filters also are made of brass, which binds less than cheaper aluminum filters.
Yes, the initial investment is significantly higher than a cheap filter. But these filters will last longer, be easier to work with, and have less adverse impact on image quality compared to cheaper filters.