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Subject: Re: You use different lenses underwater because the speed of light is different



In article , Steffen
Kluge writes
>Dave Hillstrom wrote:
>> 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.
>
>Complete rubbish. It is because of the different speeds at which the
>*lens* travels to the ground under and above water.

Pardon! If you drop the lens drag will cause it to travel to the ground
at a slower speed under water but this is not the usual condition for
taking photographs, nor is it conducive to taking follow-up shots. You
might need to reconsider your hypothesis.

--
Ian G8ILZ

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