The “protective” filter debate rages on as always, but whether for them or against them, how do they all stack up? The folks over at Lens Rentals wanted to know. The man assigned to the task, Roger Cicala, didn’t really want to know, though. He’ll “get around to it some day”, he said. “Some day” came when he was told that it would involve lasers.
The test is to essentially see which filters will, theoretically, degrade your image the least. Which causes the least amount of light loss, reflection, refraction and distortion. So, 21 popular UV & protective filters were put to the test. It’s not entirely scientific, but it does involve lasers. The results are in and some of them are quite surprising.