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It is used in conjunction with the Focusing ring.
It features a wide rubber focusing ring and a distance window with infrared index.
Just turn the focusing ring enough to put the infinity mark on the depth-of-field scale for your new f/stop.
The new cam also allows the manual focusing ring to go right on the zoom control for ease of operation.
The front of the lens does not rotate, but the focusing ring does, when using auto focus.
He slowly turned the focusing ring on the powerful telephoto lens and brought the images below into even sharper focus.
To make an adjustment, first focus the subject, then turn the Focusing ring so it matches the corresponding infrared index mark.
It is a thin knurled ring, usually located in front of the Focusing ring.
Otherwise, one has to perform that most dreaded of all photographic acts: turning the focusing ring on the lens by hand.
The lens got a scalloped focusing ring.
Outside, clamshell doors swung slowly open in the forward end of the pod, exposing hefty focusing rings.
The standard lens has an intermittent milled focusing ring without scalloping recesses.
S, launched in 1962, is the same model with a 30mm f/2.8 and a focusing ring, made necessary by the wider aperture.
Slide back a ring toward the back of the lens and what should appear but a rubberized focusing ring!
A small motor was also eliminated, so the camera does not autofocus when used with lenses that require the motor to turn their focusing rings.
It's a focusing ring (remember them?)
When set to manual focus (MF), the lens is focused using the Focusing ring.
On this Fed lens, the aperture is set on the front and focusing is done with a focusing ring.
Prime (as opposed to zoom) lenses often permit a simple resetting of the position of the focusing ring on helical inside.
Focusing ring: This control, found on most EF lenses, is used for focusing the lens.
Instead the manual focusing ring has been replaced by a very small thin focusing ring on the front tip of the lens.
The lens is "focus by wire"- the focusing ring sends commands, while the actual actuation is via a motor, even for manual focus.
It could only be used when mounted on a bellows, such as the Bellows FL, because it lacked a focusing ring.
The OM Series lenses have the aperture control located on the lens barrel on the opposite side of the focusing ring from the mount.
Early rangefinders had two separate viewfinder windows, one of which is linked to the focusing mechanisms and moved right or left as the focusing ring is turned.
