The most obvious difference is vignetting light fall off and optical vignetting (oval shape bokeh)
Is there any other such good comparison studies done? esp for the 85mm f1.2? I would like to know I am getting "something" for the extra size and weight.
p.1 #2 · z mount larger size... how does it help IQ?
Given the short backfocus of MILC the large apertyure mount is not absolutely necessary like it was with the old Canon 50/1 or 85/1.2 EF SLR lenses.
However, a larger diameter mount is stronger and more rugged. That's reason enough for me. The old F mount was often a problem over time on the larger lenses. The Sony FE mount is just OK, but subpar my Canon RF (or even the old EF) and Z.
p.1 #3 · z mount larger size... how does it help IQ?
My understanding is that it is particularly good for wide angle lenses when the rear element can be close to the sensor. I’m not a lens designer though, so what do I know?
I also remember seeing it touted that the design of the mount let lenses be smaller, and I’m a little dismayed that Nikon hasn’t pursued that much with its lens range. Perhaps the new 70-200/2.8, etc., are signs that they’re reconsidering their design priorities.
p.1 #5 · z mount larger size... how does it help IQ?
If I am not mistaken it helps in the design of wide angles and ultra fast lenses (f/1.2 or faster). I do not know if it also provides a benefit to IBIS, probably but not sure.
p.1 #6 · z mount larger size... how does it help IQ?
wind30 wrote:
I have both sony and nikon systems and I have always wondered if the larger size of nikon lens has any advantages and if so where.
The events that have taken place since the first Nikon Z cameras were introduced to the market suggest that the reason Nikon decided to make a wider mount that is closer to the sensor is to enable all lenses—including Sony lenses—to be adapted to Z cameras, having adopted a protectionist policy of not granting licenses to third-party manufacturers to produce native Z-mount lenses.
Canon has adopted an even worst protectionist policy.
p.1 #7 · z mount larger size... how does it help IQ?
panos.v wrote:
If I am not mistaken it helps in the design of wide angles and ultra fast lenses (f/1.2 or faster). I do not know if it also provides a benefit to IBIS, probably but not sure.
I recall (I think) that one of the 1001 Nights entries mentioned enlarging the mount for the Z system. The obvious geometric reason is that it accommodates a larger rear element. A mount too small effectively becomes an aperture that blocks light from the sides of the rear element from reaching that side of the sensor. The 1001 Nights article didn't describe it quite that way but did mention the viewing angle. A new mount could also let the lens sit closer to the sensor because it did not have to allow room for a mirror to swing out of the way. There wasn't just one reason. A redesigned and larger mount was the end result.
