"If UV rays can pass through the lenses why Nikon has an (expensive) UV lens
made of crystal elements?"
Because it's _corrected_ for UV. Conventional lenses are intended for UV
photography and aren't corrected for it.
>>>>>
The focal-plane shutter in an SLR cannot be damaged by sunlight. The mirror
protects it. The focal-plane shutter in RF cameras is a different matter. It has
no protection.
>>>>>
The quality of digital cameras will _never_ match the quality of film, unless
there is a major increase in the size of sensors and a major reduction in the
cost/pixel.
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