Yep, you got it.
And that is the reason that the theory of "Zoom Factor" has perpetuated the digital world. Because it is easy to explain
Yep, you got it.
And that is the reason that the theory of "Zoom Factor" has perpetuated the digital world. Because it is easy to explain
Just to complicate things further, focal length can actually change. The designated focal length is determined with focus is at infinity. When focusing on a close object the effective focal length can be less than what's stamped on the barrel. This is fairly pronounced on the Nikkor 18-200 for example, but I have yet to find it a problem in practice.
Cheers.