Free Lens Hoods.
It took me forever to find something other then just conjecture on the effectiveness of UV filters. It would seem a pretty logical thing for filter manufacturers to publish their transmissions graphs but it doesn’t seem like any of them … Continue reading
But only in Europe.
I’ve discovered a wonderful and detailed explanation of diffraction in photographic lenses and how calculate the effect relative to the pixel scale of your sensor. It also includes a couple of nice interactive examples and an online calculator.
This looks like a nice DOF calculator with hyperfocal distance calculation.