1. Oh, that lens is nifty. Now I'm sitting here looking at my camera. I didn't know how much was going on in the lens.

  2. Take notice that there are 7 lens elements in that assembly. (Two are glued together to make an "achromatic doublet", which corrects for light shift.) That is 14 surfaces. Without anti-reflective coatings, it would have very poor light transmission to the film or sensor. On average, the loss could be 2-4%/surface. The material of the lens itself has losses, and it really adds up with multi-lens designs.

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