1DX crop mode?

Started Dec 7, 2011 | Discussions thread
bobn2 Forum Pro • Posts: 57,696
Re: 1DX crop mode?

mattr wrote:

bobn2 wrote:

The EF-S concept, along with Canon's already short register gives potential advantage in size and quality for APS-C lenses.

Has the Canon EF mount a shorter register distance than the Nikon mount? If true, it is even more surprising that Nikon has a better extreme wide angle zoom.

I'm not sure Canon has ever realised the potential advantage, but it is there, had they chosen to.

As far as I know the decrease in register distance in the EF-S specifications is much smaller than the 1.6x that would allow scaling of full frame lenses. Thus, the potential advantage is modest. And as you point out, they may have chosen not even to realize it.

EF has a register of 44mm and EF-s gives perhaps another 6mm, bringing it down to 38. That's enough to make a difference, especially compared with Nikon's 46.5 (os os, don't have the exact figure to hand)

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