UV filters, unscientific test

Started 6 months ago | Discussions thread
Phil A Martin
Phil A Martin Veteran Member • Posts: 6,773
Re: Try it with a much longer lens

sybersitizen wrote:

Bing Chow wrote:

sybersitizen wrote:

Regardless, the point I wish to make here is that any sharpness degradation caused by a filter will be most apparent at much longer focal lengths. I wasn't convinced that focal length mattered in that regard until I did my own testing with some poor filters.

I would have guessed it's the other way around: less apparent at longer focal lengths. Kind of like the transition zone of a hard-edged grad filter.

That's what I originally assumed because at least some of the rays from a wideangle lens have to pass through the filter at a sharper angle, thus passing through more material ... and that means they also get shifted slightly more by refraction as they pass through. But actual testing tells a different story.

I guess the effect is already there in the wider shots but it's magnified as you zoom in?

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