Subject: Re: You use different lenses underwater because the speed of light is different
> On 23 Apr 2006 23:00:51 -0700, "cjcampbell"
> >Dave Hillstrom wrote:
> >> You can't use regular lenses underwater, that's why you always see
> >> special cameras on ocean documentaries and such. People think it's
> >> because they need to be waterproof but the real reason is the speed of
> >> light underwater is different than in air and it makes the light bend
> >> at different angles through the lenses.
> >> Einstein proved it.
> >So, I suppose that is also the reason you need different lenses to take
> >telephoto pictures than the lenses you would use for wide angle. Light
> >from different distances travels at different speeds? No doubt this is
> >due to the fact that light traveling from farther away has to go
> >through more haze, so it passes through more water on the way to the
> >camera. It would explain depth of field, too. A lens set at a
> >particular focal length can only bend light traveling at a particular
> >speed at the correct angle. Light that is going too fast or too slow
> >would, of course, bend at the wrong angle and thus the foreground and
> >background are out of focus. That being the case, you would also need
> >special lenses in space, where light does not travel through any water
> >at all.
> >Or maybe it is just wrong to encourage this nut.
> Yes it is, because he has zero interest in the topic & is posting only
> to generate as many responses as possible. Please don't encourage him.
Aren't you the same guy who told him to "Fuck off Bowtie" only seven hours
earlier? Way to not reply.
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Re: You use different lenses underwater because the speed of light is different
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