- Forum: iPhone
This is correct. In fact, an individual mirror incurs about a 1-3% loss if it's a rear surface mirror, and can be under 1% for the front surface mirrors used in optical pathways. Apple doesn't seem to be using a prism, so losses will be less there as well. Lenses can lose up to a third stop though. But that would be true, no matter what. We can tell, if we know the "T" stop, which is the true transmission number used by movie and Tv lenses.