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.
Another advantage with the added focusing lenses is they'd have more freedom to adjust the aperture size.
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Another advantage with the added focusing lenses is they'd have more freedom to adjust the aperture size.
Aperture sizes, and zoom. Zoom is an internal group shift, as you know, so, with all of this newfound room, that can now be done.
It's difficult to know the extent of the impact an iPhone would have with a built in 3:1 optical zoom, but it will, at least, be significant.