Find-that-website filter: Website with a unique explanation of lens focal length with respect to photography and zoom lenses. [more inside]
posted by odinsdream on Dec 24, 2008 - 7 answers

Let's say I find a shiny spherical object and under point lighting, I move it very close to my eye. I then focus on the bright spot, but focus at a distance of 1-2 feet until the patterns are in focus. At this point, it looks like a bad microscope. Am I looking at part of my own eye? Is this a documented phenomenon I could read about?
posted by aye on Oct 21, 2006 - 19 answers

Attention optics geeks: Will a flat water/air port affect a lens' minimum focus distance? [more inside]
posted by Popular Ethics on Apr 20, 2006 - 6 answers

Selective Depth-of-Field in Six Feet Under, and a question about lens flares. [more inside]
posted by odinsdream on Oct 4, 2005 - 12 answers