Shulou(Shulou.com)11/24 Report--

Manual focus lenses and most autofocus SLR lenses, the focus ring and the focus lens group are mechanically linked. How much the focus ring rotates and how much the lens group moves, this is the linear response.

▲ takes an externally focused macro lens as an example, where the displacement of the lens set and the focusing ring are mechanically linked and linearly responsive. * Modern autofocus SLR lenses are usually equipped with a focusing clutch, that is, the focus ring does not rotate during autofocus. If the focus ring follows the rotation during autofocus, it will affect the holding experience and there may be a "goon" situation.

Almost all autofocus microlenses and a few autofocus SLR lenses (using stepper motors or linear ultrasonic motors) use electronically controlled focus rings. The biggest feature is that there is no recent focus and infinity limit, and it is impossible to change the focus position of the lens in the event of a power outage. There is no mechanical linkage between the electronic focusing ring and the mirror group. The rotating focusing ring issues instructions, and the focusing motor drives the lens to move according to the instructions.

The electronic focus ring can not only simplify the lens design, but also contribute to miniaturization and lightweight. It also makes the use of the focus ring more flexible. For example, according to their own operating habits to set the direction of rotation, linkage mode, etc.-for example, nonlinear focus is based on the rotation speed to control the focus movement, slow to move slightly, fast to move sharply.

Here, I would like to share with you the differences in the control of focus rings among different brands:

When matching Panasonic microorders (in the case of GH6) with compatible lenses, you can set nonlinear or linear focus in the menu "focus Ring Control" option. When selecting linear focus, you can also customize the focus stroke (from 90 °to more than 1080 °).

* the focusing distance is the angle that needs to be rotated from the nearest focus to the farthest focus. The focus distance is small, the focus speed is faster; the focus stroke is larger, and the focus adjustment is more accurate.

Canon EOS R series (take EOS R7 as an example) and Fuji Micro single (X-S10 as an example) can customize the rotation direction and linkage mode of the focus ring. Among them, this feature of Canon is called "RF lens MF focus ring sensitivity", it is not difficult to see that it only works for RF lenses (it does not work when transferring EF lenses).

There is no focus ring control option on the Sony fuselage, whether linear focus depends on the lens. For example, Sony's original lens with "Linear response Manual focus" (LR MF) must be linearly focused.

This article comes from the official account of Wechat: camera Notes (ID:xjbiji), by Teng Fei et

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