June 2013
Intermediate to advanced
312 pages
7h 42m
English
Content preview from Photography Q&A: Real Questions. Real Answers.Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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All lenses are not created equal.
Q: DO TWO LENSES—ONE PRIME AND THE OTHER A ZOOM—LET IN THE SAME VOLUME OF LIGHT GIVEN THE SAME APERTURE? WILL AN 85MM PRIME AT F4 GIVE THE SAME EXPOSURE AS A 24–105MM ZOOM AT F4? DOES THE LENS CHANGE EXPOSURE?
A: An 85mm at, say, f4 should let in the same amount of light that a 24–105mm lens at f4 brings in. “Should” being the key word. In the real world, though, you may find this is not the case.
Manufacturers are often allowed a +/– 1/3 stop variation in manufacturing tolerances. That means that one lens at 2.8 could be +/– 1/3 of a stop from another lens at 2.8. You could own two lenses that are possibly 2/3 of a stop off from each other.
You may come across an old, used lens one day that has “+1/2” or “–1” ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.