From the LensRentals Blog:
I posted an article about circular polarizing filters recently, letting you see some data I obtained for Lensrentals when they were reviewing which of the polarizing filters were among the best. I concluded that they all polarized light really well. I also said that none of the CPs I tested seemed to cause optical problems at 200mm and under, that some transmitted more light than others, and that you could tell that just by looking at them.
Which brings me to Roger’s First Rule of This Blog.
Rule #1: I am not responsible for what someone else says I said. If I say something wrong, I’ll correct it. If they say I said something I didn’t say to drive some click-bait, THEY said it. Not me.A bunch of people wanted hardness tests, scratch resistance tests, light scattering tests, torque tests, and a 5-year failure rate. I want a pony to ride on my yacht. Sadly, none of the above is happening.
A whole lot of other people asked me to test something out of the price range I was examining; mainly they wanted to see how inexpensive filters did. That was reasonable, so I bought a couple of inexpensive CP filters and repeated the tests on them. You will need to look at the last article on the $100-$200 range filters to get some perspective before looking at this.
See the entire blog post on the LensRentals Blog.
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