rscheffler wrote:
The list appears to be the same lenses that support full H+ speed in EFCS/mechanical shutter. IOW, released since around 2010-2012.
That makes sense, actually. In fact, it seems likely that Canon was looking forward to changes in the RF mount years before system introduction, and added compatibility to EF lenses that were being introduced during that time. Gives you some perspective on how long the product planning phase is.
rscheffler wrote:
With respect to focus shift, are there any EF lenses other than the 50/1.2 that would benefit from this feature? I don't remember there being many with strong under-corrected spherical aberrations. Maybe the 28/1.8? But don't remember anyone ever complaining about that lens exhibiting focus shift. EF 50/1.4?
I used the 28 f/1.8 for many years, and actually still have my last copy. It gave good center sharpness from about f/2.0 for my use cases. I have never noticed any focus shift, but I may fish it out of storage and check it.
The corners are ridiculous--they never get truly sharp even stopped down--and the bokeh is quite nervous, but I've always had a soft spot for this lens anyway. In particular I appreciate its mechanical design, which is a perfect complement to the 50 f/1.4 and either the 85 1.8 or 100 f/2. (These three lenses made a fine kit for a documentary style shooter like me, and in this genre, "character" lenses are almost a tradition, haha.)
