Are Full Frame SLRs Obsolete?

Started Jan 4, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Telephotos are the same size regardless

Flying Fish wrote:

Why can't Canon make a smaller, lighter, less-expensive 500 f/4 or even a 600 f/4 for my 7D?

Because telephotos don't scale that much with sensor size. At most the metal tube might be slihtly slimmer at the mount end.  500mm and f/4 are physical constraints - unless you use diffractive optics or folded optics, it's gonna be about the same length and f/4 means the front element is going to be about the same size. Now if you mean you want a smaller, lighter lens with the same FOV as 500mm on FF and f/4, then Canon already makes it -- it's called the 300mm f/4.

Olympus made a 300mm f/2.8 for 4/3 - and guess what? It's the essentially same size as the Canon 300mm f/2.8 even though it's for a sensor 1/4 the size.

100-400 f/4.5-5.6L; all the super-teles, all the macros; and so on and on.

See above - the lenses you want are constrained by physics. There is one macro Canon makes smaller for APS-C - the 60mm EF-S macro is equiv to the 100mm macro but nothing else would be smaller.

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