UV filters, unscientific test

Started 6 months ago | Discussions thread
RCicala Contributing Member • Posts: 777
Re: Test @ 200mm

So people who report degradation are either using REALLY bad filters, using less rigorous technique (flimsy tripod, handholding, difficult subjects, changing outdoor conditions), or they're just parroting what they read and they haven't really tested themselves.

I like your tests, don't get me wrong, and agree with your conclusions in general. But in science when you don't find something others find, you must also consider that they are using more, not less, rigorous testing methods.

I say this as someone who tests batches of filters for several filter brands for their QA departments. An interesting thing we've found in doing that is the manufacturers (with a few exceptions) buy their glass from China and a constant problem is batches of glass that don't meet specifications.

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