Talk:Filter (optics)

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[edit] Stuff removed

Removed this from the ND filters section:

If such filters are dark enough, they can make looking at the sun safe (don't try this without expert advice!).

Since this is really awful advice. Most ND filters don't block mid-IR very well, so if you look at the sun with them, you're risking cataracts. (You need something like welder's goggles to block MIR). -- DrBob 18:29, 25 Oct 2004 (UTC)

Heh. On that note I found this really cool idea that involves the converse - taking a solar filter and using it as an ND filter (it just happened to be close to neutral density, I guess solar filters don't have to be in general): [1] Rawling 14:25, 11 December 2006 (UTC)