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Making photos under the water with common camera.
Is this possible. Or this need different optics.
Is this possible. Or this need different optics.
And what happens if water is touching lens (so no air it is in front of the lens, so it is not water-tight). Is it possible to do photos?
In that case the front element of the lens will have almost no optical power.
The lens elements bend light because of the difference in refractive index between air (1) and glass (around 1.5), if you replace air with water (1.33) the difference in refractive index is much less and the bending power of the lens is reduced by 75-80%.
It depends on the design of the lens but generally most of the optical power is in the front surface of the first element (especially in wide angle camera lenses) so I wouldn't expect most lenses to produce an image.