T3D Re: Unterwassergehaeuse

[john bercovitz <bercov@xxxxxxxxxxx>]

OK, I made up the word.  Anyone speak German?  How's it look?  
I put it together using http://dict.leo.org/cgi-bin/dict-search
8-)

I would think there would be a couple of problems with using a 
housing around a camera intended for use in air.  One is the 
focussing problem which would be non-existent for objects at 
infinity and the other would be the introduction of spherical 
aberration.  I guess that's why cameras such as the Nikonos are 
made: then the designer can address these problems.

I just did some quick figuring and it seems that the apparent 
distance to an object which is under water is just the actual 
distance divided by the index of refraction of the water, at
least until the object is very very close at which point it 
appears even closer than this formula would indicate.

John B


------------------------------