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12-30-2015, 03:19 PM   #1
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DA* 300mm Polarizer help Exus or B+W?

Yet another which filter to buy thread... Need advice from those who actually use the DA* 300mm with a 77mm polarizer for birding in dry desert environments.
I've narrowed it down to Either the Marumi EXUS or the B+W KSM HTC (effectively the same price). I'm leaning toward the Marumi simply because of the Exus Anti-static coating for the dry desert environment, but wanted to get opinions on IQ differences (if any) and real world experience between the two?
Adorama points out that both are High Transmission filters with 1.5 or under stops

Marumi EXUS
Filter Factor: About 2.5 (1.3 stops)
Multi-Coated: Anti-static and water- and oil-repellent coating

B+W KSM HTC
Filter Factor: 2 to 2.8 (1 to 1.5 stops)
Multi-Coated: Yes

For reference, I already use the 67mm B+W KSM MRC on a Tamron 28-75 and a 58mm Marumi DHG Super on a 55-300. They both appear about the same when viewed side by side, but I'm interested in the new generations for the DA*300 and don't want to compromise IQ if one doesn't match well to the Pentax glass.
I also have an 86Cmm Professional Tiffen polarizer that I could use step down rings to fit, but that negates the use of the hood and IMHO, not as good as the other two.

Anyone have specific usage of these two on the DA*300?

ggascay

12-30-2015, 03:27 PM   #2
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No. But I use a CPL Marumi Exus on my FA 31 and have nothing but praise for it. It makes a good picture great.
12-30-2015, 06:59 PM   #3
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QuoteOriginally posted by ggascay Quote
Yet another which filter to buy thread... Need advice from those who actually use the DA* 300mm with a 77mm polarizer for birding in dry desert environments.
I've narrowed it down to Either the Marumi EXUS or the B+W KSM HTC (effectively the same price). I'm leaning toward the Marumi simply because of the Exus Anti-static coating for the dry desert environment, but wanted to get opinions on IQ differences (if any) and real world experience between the two?
Adorama points out that both are High Transmission filters with 1.5 or under stops

Marumi EXUS
Filter Factor: About 2.5 (1.3 stops)
Multi-Coated: Anti-static and water- and oil-repellent coating

B+W KSM HTC
Filter Factor: 2 to 2.8 (1 to 1.5 stops)
Multi-Coated: Yes

For reference, I already use the 67mm B+W KSM MRC on a Tamron 28-75 and a 58mm Marumi DHG Super on a 55-300. They both appear about the same when viewed side by side, but I'm interested in the new generations for the DA*300 and don't want to compromise IQ if one doesn't match well to the Pentax glass.
I also have an 86Cmm Professional Tiffen polarizer that I could use step down rings to fit, but that negates the use of the hood and IMHO, not as good as the other two.

Anyone have specific usage of these two on the DA*300?

ggascay
I use the B&W 77 on my DA*200 and have the Marumi Exus for my FA 31. Both are great. I cannot detect any visual differences or exposure differences and glare is eliminated neatly by both. The B&W Kasseman has a smoother dampened rotation that I can detect. Otherwise they are equals. Lenstip CPL tests came to the same conclusion, with the Marumi getting value points in the rating for a slightly lower cost. I guess whichever is cheaper at the time and place of your choosing.
12-30-2015, 07:08 PM   #4
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I have both B+W and Marumi CPLs and do not see any difference. They are both very good.

12-31-2015, 01:22 AM   #5
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I just found the NEW Lenstip.com Circular Polarizer test from Nov 2015 With the Hoya Fusion (evo?) anti-static on top with the B+W and Marumi co-listed as #3. Not much information about the Hoya Fusion, other than it appears to have some good color and deeper IR cut, but at an overall higher light attenuation than the other two. Oh, and it's a lot cheaper too.
I think for me, I want to get anti-static, so the Marumi EXUS with higher light transmission may be the winner with the Hoya a very close second.

ggascay
01-05-2016, 10:46 PM   #6
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Purchased the Marumi EXUS Pro

Following up on this thread I decided on the Marumi EXUS Polarizer for the anti static and other lens coatings as well as the extremely high transmission rate. Initial indoor nighttime exposure tests only saw one full f-stop of light loss between bare lens and polarizer. That's much brighter than both the Marumi DHG super and B+W KSM MRC filters I use on other lenses, but will have to wait for a sunny day to test further and check color cast, if any.

ggascay
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