B+W MC filters not coated as evenly as Hoya MC filters?
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26 posts so far. KR wins again.
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Do you possess KR's reputation?
It may matter if one had a stack of filters in ones bag. Yes, brass filter rings are better because their threads are more resiliant and they lesser tend to stick. But then one should not overlook that there are brass and aluminium lens barrels and one could do the same discussion on then too.
Almost. You need to add a decimal point at the end of that 87. That means you used science! And if you make a videos, be sure to wear glasses and a white lab coat. Only a Pope hat can beat a lab coat, and those are ultra rare.
I own filters from all of the major brands and many of the generic ones. I have a couple that have noticeable flaws (in both expensive and generic brands), but outside of the quality of the threads and the color temperature of the neutral density (and polarizers), they’re all pretty much the same. Even when I tested them on USAF charts. So anytime someone claims brand X is superior to brand Y, I change the page.
My guess is that B&W filters are expensive, so Ken probably bought a used one that had been cleaned with something that damaged the coating and compared it to a brand new Hoya.
Another POV: a troll won again.
Okay. Glass half full. You’re right. 
Vaguely recollected from a book on telescope making, you can measure the thickness of coatings with a scanning interferometer, the scanning interferometer can read down into nanometer territory, something that a seat of the pants measurement cannot hope to equal.
My large kits comprises both Hoya HMC and B+W -- chiefly their KSM circular polarisers from 67mm to 82mm, and Hoya's in Skylight, UV, red and yellow.
Hoya's filters have been manufactured by Tokina Lens Co. since 1995. B+W has the technology of Schneider Kru. behind it.
I have no reason, over many, many years of experience using both these filters, to question the quality of the coatings.
I have, however, had reason to question the statements that Ken Rockwell makes, and the one that is the subject of this thread can safely be consigned to the shit bin.
Hoya's filters have been manufactured by Tokina Lens Co. since 1995. B+W has the technology of Schneider Kru. behind it.
I have no reason, over many, many years of experience using both these filters, to question the quality of the coatings.
I have, however, had reason to question the statements that Ken Rockwell makes, and the one that is the subject of this thread can safely be consigned to the shit bin.
If they are not coated as evenly, you can bet there is a good reason and it probably is not to "save money" unlike many other manufacturers........Regard!
Does that mean that all the pictures that Ansel Adams shot before WW2 with uncoated filters are worthless. Oh, the shame of it all! There are also pictures from the 19th century that I like, probably taken with no filters. They can't be any good. What was it the Englishman said: "Much ado about nothing"......Regards!
You mix up things, chip.
The general meaning of coating we use here at Apug refers to anti-reflective coatings.
And as hinted at above, many filters in the good-old-days were not coated. We also had discussions here whether just these two surfaces are of importance in an optical system that often is built up with at least 14 surfaces.
What you are referring to are the modern, no-stain or so coatings. So far the few samples I got are practically not to be cleaned without leaving some traces in reflective light. What at least is irritating compared to plain- or even un-coated at all surfaces.
The general meaning of coating we use here at Apug refers to anti-reflective coatings.
And as hinted at above, many filters in the good-old-days were not coated. We also had discussions here whether just these two surfaces are of importance in an optical system that often is built up with at least 14 surfaces.
What you are referring to are the modern, no-stain or so coatings. So far the few samples I got are practically not to be cleaned without leaving some traces in reflective light. What at least is irritating compared to plain- or even un-coated at all surfaces.
I haven't been applying enough attention to this thread to make a meaningful comment but just before I saw your comment, Eric, a thought had struck me that reflects your thoughts. Namely we have users here of both Hoya and B+W filters. Each group seemed satisfied with their filters until we get an alleged statement from KR which seems to set up a contest.
I haven't seen anything resembling a scientific article on this and it isn't even clear to me how KR meant us to interpret what appears to be a statement on coating. Frankly it isn't a lot different from one member's statement that he will never, ever use Xtol again without even fully explaining why that is. We tend to assume that there must be something wrong with said substance when all we should assume is that he had a bad experience at least once with Xtol - causes of this remain unknown
I mention this as an example of how we can draw conclusions from a statement that are not justified from that statement and not to start another argument on Xtol.
pentaxuser
Thanks for the update.
Maybe everyone will start selling their B&W filters. That would be great; there are still a few I'd like to have.
I see no reason why they should not have been coated, unless the coating chamber would heat up excessively. And in case of trouble one could coat the covering panes in advance anyway.
It just was not usual to coat them. I already said than one could argue on the impact of 2 uncoated surfaces within a system with many more surfaces.
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