polarizing filter for omd1 mk2

rwa7425

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I'm looking for a quality polarizing filter that fits on a 12-40mm lens for my omd1 mk2. Preferably one that has brass threads. My researchAny suggestions would be appreciated.
 

Mack

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Breakthrough X4 Polarizer is also brass.

However, I'm leery of using a polarizer on a telephoto as it seems to require me to tune the AF to something other than normal. I did some tests in this thread, and some others chimed in saying their polarizer also affected a Canon and a Nikon. It wan't far off with the 300mm f/4, but putting the 1.4x TC onto it shifted the AF Tuning 9-10 points verses without the polarizer.

Tests: E-M1X is forgetting the AF Tuning settings.

On a wide angle lens, it requires a lot of sky burning in if I'm not careful of going too far.
 
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DrNuy

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I have a Hoya Cir-PL.
It has a slim plastic frame, not very convenient (cannot keep the cap firmly).

BTW, with hybrid cameras, do the polarizing filters really need to be of the circular type ?
Would there be a relation with AF related problems ?
 

rwa7425

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Oct 20, 2017
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Breakthrough X4 Polarizer is also brass.

However, I'm leery of using a polarizer on a telephoto as it seems to require me to tune the AF to something other than normal. I did some tests in this thread, and some others chimed in saying their polarizer also affected a Canon and a Nikon. It wan't far off with the 300mm f/4, but putting the 1.4x TC onto it shifted the AF Tuning 9-10 points verses without the polarizer.

Tests: E-M1X is forgetting the AF Tuning settings.

On a wide angle lens, it requires a lot of sky burning in if I'm not careful of going too far.
Thanks for the quick reply. I did not consider the impact of the CP on the telephoto. Will have to some more research.
 

Michael Meissner

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IIRC, except on the E-m1x and E-m1 mark II, a linear polarizer may not affect Olympus & Panasonic cameras, because they don't have the phase detect sensors. But the majority of polarizers are circular polarizers to work with phase detect cameras.
 

Mack

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I had issues with a polarizer on the E-M1X and decided to take it out on the E-M1 Mark iI and try it. Short answer is it required me to set the AF Tuning to a +6 or +7 using it on the 300mm or the 300mm plus the 1.4x teleconverter (i.e. 420mm) respectively. Filter was a Marumi DHG circular.

If your camera doesn't have the ability to fine tune the auto focus, you may have some soft images using one. Results are shown below with the 300mm without the polarizer on the left, and with it on the right. Same for the 420mm setup below that.

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b_rubenstein

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IIRC, except on the E-m1x and E-m1 mark II, a linear polarizer may not affect Olympus & Panasonic cameras, because they don't have the phase detect sensors. But the majority of polarizers are circular polarizers to work with phase detect cameras.
The type of AF detection has no effect on the type of polarizer required for a mirrorless camera. It's the effect of the mirror in a SLR camera that can effect metering and AF.
 

Mack

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For fun, I just ran the 45mm f/1.2 Pro through the test without and with a polarizer on the E-M1 Mark II. The result was it needed far less auto-focus fine tuning than the telephoto did. It only moved one point positive using the same polarizer verses the seven point positive with that polarizer on the 300mm/420mm lens.

It seems the stronger the lens magnification, the more the polarizer influences the auto-focus tuning (To the plus side.). Less likely to get into focus issues with the non-telephoto lenses, imho.

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Mack

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I also ran the 12-100mm at the 100mm FL setting to see how it would do given it is a bit of a telephoto, and about the only mid-range telephoto lens I have before the 300mm. It only showed one point positive over the default set. Puzzling, but it seems the stronger 300mm is doing something along with the polarizer filter to throw off the AF by 7 points.

Some Sony owners on the Fred Miranda site mentioned issues with polarizers going over 300mm FL resulting in soft images too. No issues from 100-200mm, but 300mm and there goes the AF. Polarizer impacting image quality on telephoto lenses?

Others speculate the loss of light through the polarizer might affect the focus, but I've shot with a 3 and 6 stop ND filter and hairs and bird's wing feather fibers are still tack sharp. The Marumi DHG polarizer, dunno, but it seems to have good ratings - unless it is doing some odd coloration or contrast thing the AF system doesn't like with the 300mm.

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Mack

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I am using B+W CPL Filter 62mm MRC Nano XS-Pro for this lens since years and I am happy with the result so far.
I was looking at that B+W filter earlier on and saw where one guy felt his Hoya was sharper in the images on the website than the B+W. Here: http://www.photocornucopia.com/1018.html

Might be all these polarizers are sharp, but some physical designs are causing the AF system to need an adjustment for some back-focus or front-focus error and then they are okay. Knowing I can get the Marumi DHG filter to function well by applying a +7 to it with the 300mm is okay with me since I can adjust that. However, if I had a camera where I couldn't fine-tune the AF then it might be a cause for concern - and maybe never use a polarizer on that camera either.
 
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