Re: CR: Canon Sends Invitation For Major Mirrorless Presentation
Pixel Perfect wrote: arbitrage wrote:
I believe the EF-M mount is big enough for FF sensor, or is it? I agree with Dan that most likely will be EF-M mount (if that can cover FF sensor). I also agree this will be a camera for people still stuck in the Canon world and maybe, just maybe could attract back some Sony guys who still use mostly Canon lenses....but Canon will really have to wow that crowd to get them back.
If Canon's adaptor allows AF as good as a native EF-M (FF) lens and if Canon has AF features as good as Sony's latest series then Canon probably doesn't have to rush out native EF-M FF lenses as they won't be any smaller anyways based on Sony's high end FE lenses. They should concentrate on getting out native EF-M FF lenses in the type of focal lengths that can be made smaller on a mirrorless camera and won't have to worry about something like an EF-M 70-200/2.8 or 100-400 for a good while.
EF-M opening diameter is 47mm, so larger than FF diagonal of 43.3mm, however it is 7mm smaller than EF and EF-S diameter of 54mm. I don’t think they’ll use that mount, that might restrict them on fast glass, it limits the exit pupil diameter which affects vignetting, limits ability to use TS-E lenses, and alters design of lens to be more asymmetric which affects DoF and OOF highlights.. Nikon is going to use a 49mm opening diameter and a 16mm register on their new Z mount. Having said that Sony’s E/FE mount is 46.1mm in opening throat diameter, and also 18mm register, som EF-M is viable. But I’m not sure Sony has intentions for f/1.2 or faster glass. Nikon already has f/0.95 patents for mirrorless lens. Maybe Canon will be happy with f/1.4, or will accept heavy vignetting ng on faster glass?
I read in some forums that Nikon many times proved their statements wrong. One guy was told during a product demonstration (after Canon introduced AF in lens), that Nikon couldn't do that, the F-mount was too small to allow AF in lenses.
Another was was told that a successor for the 105/1.8 wouldn't be made, the F-mount being too small and electrical contacts would make the rear elements too small.
So I am not convinced that Sony and Canon can't make f1.2 lenses in their new mounts, although of course distance and mount diameter restrain the maximum speed of the lenses.
Jan 22, 2018 at 08:31 AM
Previous versions of Holger's message #14335560 « CR: Canon Sends Invitation For Major Mirrorless Presentation »
