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GeorgCantor

Potomac, US
138 posts

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GeorgCantor Silver Member Nikonian since 09th Dec 2012
Fri 06-Dec-13 03:02 AM

Here are some elementary questions. I have a 35-70 f/2.8.

1. How, mechanically, does the lens maintain the constant f/2.8?

2. Does the image projected onto the sensor plane always just contain the FX rectangle, or is there waste (wasted photons) outside that rectangle (other, of course, than the photon wastage becasue of the circular projection outside the inscribed rectangle)?

Thank you.

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