Nuovo Nikon 105mm f/1.4

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“ Comunque per chiudere definitivamente il mio intervento, io una cosa la provo, la uso, ci lavoro e la valuto, non sto a chiacchierare di sensazioni immaginarie per anni.....sono un curioso esploratore della vita, non un frustrato blateratore evangelico del lamento. @giorgiomilone „

“ tu preferisci qualcuno che critica quello che ha, o qualcuno che critica quello che non ha? „

“ Nikon F and Canon EF Mount Size Differences

Another key difference is the physical mount size ? Nikon F mount's “throat” diameter is 44mm, whereas the Canon EF mount is larger at 54mm. That 10mm difference might seem small, but it is actually quite important when it comes to lens design. If you have been wondering why Nikon does not release fast f/1.2 primes with autofocus, while Canon has the excellent 50mm f/1.2L and 85mm f/1.2L II lenses in its stable, the answer is primarily in the limitation of the physical diameter of the Nikon F mount. It would be very cost prohibitive for Nikon to try to design f/1.2 lenses with autofocus capabilities, because of space limitations on the rear side of lenses. Such designs would have to be limited to under 60mm focal length range and even then, the CPU contacts would probably have to be put right on the rear element. Anyone who has tried to make the classic Noct-NIKKOR 58mm f/1.2 CPU-capable knows that it requires grinding the rear element to fit the contacts ? there is no other way to do it. And forget about longer focal lengths, because it would never fit. In fact, if you look at the rear of the Canon 85mm f/1.2L II, which appears significantly larger than the rear element of any Nikkor, that lens required Canon engineers to put the CPU contacts right on top of the rear glass surface. Take a look at the below image comparing the the Canon EF 85mm f/1.2L II with the Nikkor 85mm f/1.4G: „

“ The size differences are obvious. Hence, Nikon would not be able to make such a lens due to the smaller diameter of the Nikon F mount. Shorter focal length f/1.2 lenses would be possible to engineer, but they might require cutting into the glass as described above, which would complicate both the design and the manufacturing process of such a lens, making it very expensive and potentially impractical to sell. Nikon would have to charge thousands of dollars for a 50mm f/1.2 AF-S lens, which would be extremely tough to market. Such a lens would have to be made to order in limited quantities, similar to some of the exotic super telephoto lenses.

In contrast, Canon has an advantage here ? shorter focal length f/1.2 lenses in the 50mm+ range can be designed easier, since the mount diameter is large enough to accommodate such optical designs. In fact, the Canon EF mount allows for a 50mm f/1.0 and 200mm f/1.8 lens designs (and we have seen such lenses in the past), which would be close to impossible to achieve on the Nikon F. Having a large diameter lens mount is not just needed for super fast primes though ? it can potentially simplify the overall lens design too.

Another advantage that some people point out is durability ? since the Canon EF mount is physically larger, some people argue that it is also more durable. I personally dismiss this claim, because the Nikon F mount is big enough to be quite durable and I doubt the Canon EF mount would have a noticeable advantage here „

“ Oggi invece c'è chi da la stura alle critiche più fantasiose in base alle più fantasiose recensioni messe in rete da chi è più sfigato di lui. „