I use B+W MRC and Hoya Pro CPs. I had problems with both Tiffen and Heliopan 
mounts at some point, and have had these in 49, 52, 58, 62, 72, and 77 mm sizes 
, bought over the period from 1994 to 2010. No problems with them. 

Godfrey


> On Jul 21, 2015, at 11:11 AM, Igor PDML-StR <[email protected]> wrote:
> 
> 
> Hi All!
> 
> Yesterday, while shooting through a window glass at a gymnastics complex, I 
> was regretting I didn't have a polarizer, with all the reflections and glare 
> I was getting from the glass.
> A polarizer for all the new Pentax lenses that I bought in the past 5-6 years 
> (17-70, 50-135, 60-250), has been on my "to think about buying" list for a 
> while, but haven't been a priority because of the character of most of the 
> photographs I've been taking in these years. But now, it's time to "pull the 
> trigger". And, fortunately, these three lenses have the same filter diameter.
> 
> So, I refer to the collective wizdom of PDML.
> It's been a while (more than 14 years) since I've bought a polarizer, and I 
> haven't been following the trends on those recently.
> 
> Any recommendations (or anti-recommendations) for a circular polarizer (67 
> mm). This would be used for (1) removing glare and reflections,
> (2) dealing with the sky (haze, ...).
> 
> The best (optically) filter I have is a slim one by B+W. I was using it with 
> 18-35 and 28-70 Tokinas (77mm). There are two downsides of that one:
> 1. It can be _very_ hard to unscrew it, especially when it's cold.
> 2. Front lens caps don't stay on it. The original ones from Tokina lenses are 
> snap-on, and there is not much space on the inside of this ultra-thin filter. 
> The cap that came with the filter is a "push-on", but it is not tight at all, 
> and doesn't stay.
> 
> I wonder if other B+W filters (or for that matter filters from other brands) 
> are also prone to these problems, or it is specific to this (or some) 
> filter(s).
> 
> Should I consider B+W? And if so, - MRC or SC?
> (Is it worth at all considering a "Kaesemann High Transmission" one? It's 
> almost twice as expensive.)
> 
> Should I consider some other brands (Hoya, Tiffen? ? (Any hidden jems?)
> 
> 
> How is Bower HD? Does anybody here have one?
> http://www.bhphotovideo.com/c/product/972392-REG/bower_fp67cc_67mm_digital_hd_circular.html
> At $7, it is very appealing, but I don't want to degrade my lenses.
> There are only 4 reviews on B&H, and none on Amazon, even though it has been 
> listed there (presumably) since June 2011.
> Other sizes (on Amazon) got also very few mixed reviews. Some complaints are 
> about it being hard to remove....
> 
> 
> One stupid question: when I look at the list of 100+ CPs in this size on B&H, 
> some mention rotating filter ring, while others don't.
> For a CP, I assume that's a must, and I can barely imagine one without that. 
> (But, in principle, one can untighten the filter and adjust the orientation 
> that way.) So, just in case, - are there any CPs that don't have rotating 
> ring? (Or mentioning one is just a marketing ploy?)
> 
> Igor
> 
> 
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