re: Sapphire... Isn't it only the lens cover using sapphire glass? The bit of glass that's attached to the case and not the lens elements themselves.
That's good. The advantage of sapphire its hardness, not its optical properties; it's used for scratch resistance. Optical glass is better for the refractive elements. Leica lenses, the best in the world, are glass (uncompromised optical quality). The crystal on my Submariner watch is sapphire (uncompromised durability).
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