Nikon 85mm F1.2 Ｚ發佈了

elfwong wrote:
2.Nikon 故步自封的守在傳統的步進馬達或音圈馬達, 對焦速度就會"明顯輸"SONY的XD線性馬達一截
就永遠沒機會扭轉命運, 跟冠軍爭輸贏

elfwong wrote:
你太小看最高階了, 最高階產品的競爭力才是整體銷售的標竿,
冠軍品牌通常都有冠軍技術高階產品

MUS wrote:
整體銷售的標竿? SONY...(恕刪)

mobile0134 wrote:
跟你想的不一樣，兩家都用一樣的東西，只是使用的名字不同。

Nikon 用在400mm Ｚ上面的voice coil motor (VCM)就是線性馬達，定子是磁鑄件，轉子（為了理解，應該不叫轉子，拉直了不用轉的線圈），就和喇叭耳機的運動方式相同。Sony XD 機構模組就是Nikon 的VCM, 沒有本質的不同。Nikon只是用了比較合乎原理的方式命名，SONY則用了比較炫的名字。Nikon是用與不用在特定鏡頭而已，沒有你講的沒這技術所以會明顯輸Sony一截這件事。Nikon 1 NIKKOR VR 70-300mm f/4.5-5.6 就用了VCM。有業內人士，歡迎指正。

elfwong wrote:
雖然N,S兩家砲鏡的...(恕刪)

Hayashi-Kiyoshi wrote:
至於為何Nikon要冠個VCM給SSVCM，我也不知道。

Hayashi-Kiyoshi wrote:
但彈簧是兩面刃，鏡頭移動太快就跟彈跳床一樣...

elfwong wrote:
SONY XD馬達介紹沒提到音圈馬達, 應該就是"非音圈型"的線性直流馬達

所以個人大膽猜測
SONY很有可能採用 "非音圈"型線性馬達
其推力也有可能比Nikon 的"音圈型"直流線性馬達"略大"

Nikon interview:
Why the use of stepper motors in Z lenses as opposed to linear motors? Can we expect to see faster focus group in future S-series lenses?

There are many reasons we have chosen to use STM motors instead of linear motors in most NIKKOR Z lenses. First is that STM motors are excellent in responsiveness and quietness despite their small size and lighter weight. The small size and light weight increases the degree of freedom in designing the mechanical mechanism, and also is beneficial to video recording to minimize sound. In order to maximize the responsiveness of STM motors, Nikon has developed its own dedicated drive IC (integrated circuit). It enables a synchronous control drive that synchronizes multiple motors at the micron level. Regardless of the product size, multi-focus is achieved, ensuring high focus accuracy and smooth focus drive for attractive video shooting and close-up shooting.

A linear motor is an effective power device for driving a larger and heavier lens group at high speed, but is inefficient for smaller and lightweight products, as it requires a separate sensing function, making it not space-efficient for smaller products or products with multi-focus.

For future S-Line lenses, we intend to continue to achieve high-speed AF with thoroughly optimized control, mechanical mechanism, and power device, aiming to combine it with the optimum drive system according to the shooting subject and environment.

Hayashi-Kiyoshi wrote:
因為STM可以精準定位不需要position sensor

哪裡可以預購Z85mm f1.2s？

國祥目前都沒消息說。