Lens design questions

[RGF]

I have noticed that Canon has started to design L lenses with the focus ring closer to the body and the zoom ring closer to the front of the lens. Lenses like this include (not an exhaustive list): 70-300L, 100-400 II. Wide angle lenses tend to the have zoom ring closer to the body.

Is this new to Canon or have been been older L / pro lens with the zoom ring closer to the front of the lens? I am not familiar with this design?

Does Nikon user this design?

Other manufacturers?

If there are any lens designers in the audience, what is the advance of each design.

Thanks

 

[ajfotofilmagem]

Canon L lenses prioritize quality construction, and if possible picture quality. Retrofocus lens designs facilitate fast focus without moving the front element, and aberration correction. The trend toward lens L is the ring USM is near the rear of the lens, saving size and weight.

Exception to this are the STM lens where the focus ring is only an electronic sensor, and can be located in any portion of the lens, regardless of whether or not retrofocus.

 

[RGF]

Canon L lenses prioritize quality construction, and if possible picture quality. Retrofocus lens designs facilitate fast focus without moving the front element, and aberration correction. The trend toward lens L is the ring USM is near the rear of the lens, saving size and weight.

Exception to this are the STM lens where the focus ring is only an electronic sensor, and can be located in any portion of the lens, regardless of whether or not retrofocus.

So is the focus ring near the rear of the lens something we should expect for tele zoom lenses in the future (especially L series)?

 

[ajfotofilmagem]

Canon L lenses prioritize quality construction, and if possible picture quality. Retrofocus lens designs facilitate fast focus without moving the front element, and aberration correction. The trend toward lens L is the ring USM is near the rear of the lens, saving size and weight.

Exception to this are the STM lens where the focus ring is only an electronic sensor, and can be located in any portion of the lens, regardless of whether or not retrofocus.

So is the focus ring near the rear of the lens something we should expect for tele zoom lenses in the future (especially L series)?

I believe so.
But, if we consider a long lens as 600mm, the location of the focus ring "close" to the rear of the lens, can be almost 20 cm away.