![](/images/new-backgrounds/1181232/18123221x1.webp)
Install the lens
Loosen the single screw on the adjustable ring of the flange back by turning it
Otherwise, it can cause damage to the internal image sensor or the lens when you install the lens on the camera.
C direction
Iris Control
Cable
Adjust the back focus
The back focus of a camera is predefined by the factory default. However, some models are out of focus depending on the lens type. If your camera is out of focus, follow the instructions below to adjust the back focus. The following is the procedure used to set the proper back focus point in fixed focus lenses.
Lens without zooming feature
1.Capture a sharp subject (with a grid pattern) more than 10m apart and adjust the focus ring to the infinity ( ∞ ).
2.Adjust the adjustable ring of the flange back so that you can capture the sharpest image.
3.Fasten the screw of the adjustable ring of the flange back.
Lens with zooming feature
1.Capture a sharp subject (with a grid pattern)
2.Adjust the zoom in the WIDE direction as possible and turn the adjustable ring of the flange back so that you can capture the sharpest image.
3.Repeat 1 and 2 above
4.Fasten the screw of the adjustable ring of the flange back.
-If you darken the image before adjusting the focus by attaching
the ND filter to the front of the lens, you can get a sharper focus.
ENG![](/images/new-backgrounds/1181232/18123221xi4.webp)
11