- Set the lens's physical focus to infinity (clockwise from the front).
- Aim the camera at the desired subject.
- Release the back focus mechanism on the camera.
- To get the best picture possible, adjust the back focus.
- Secure the back focus mechanism of the camera.
The 'focal flange length' is referred to as 'back focus.' This is the distance between the CCD and the back lens element.
A camera having a focus ring on the back. It will be found at the back of the lens housing. A rear focus chart, such as the one shown, is useful, but any object with high contrast will suffice.
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