PRECISION FOCUS LENSES
Fujinon’s exclusive Precision Focus Assist is now in the fourth generation and features improved focusing response, lower light loss and reduced size. The PF system is the only focusing system that can maintain focus at any zoom position from the narrowest to the widest angle.
Focus Lens Group | Master Lens Group |
Zoom Lens Group
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Master Lens |
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A |
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Group for PF |
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| B | ||||||||
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Focus on the nearside (+) |
| Position equal to the image | |||||||||
| plane of the camera. | ||||||||||
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| Focus Lens Group |
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| CCD A for PF | CCD B for PF | ||||||||
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Move to infinity side | Contrast | ||
Motor |
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Best focus (O) | Position equal to the image | ||
plane of the camera. | |||
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Focus Lens Group |
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| CCD A for PF | CCD B for PF | |
Stop | Contrast |
Motor |
The
CCD for Camera
CCD for PF | CCD B for PF |
CCD A for PF
Position equal to the image plane of the camera.
A half mirror located behind the iris directs light to CCD A and CCD B. The CCD's are spaced optically at equal distance to the image plane of the camera and are used to measure image contrast.
Contrast value of CCD B is lower than CCD A.
Focus on the nearside.
Lens focus will move toward infinity.
Contrast value of CCD A and CCD B is equal.
Focus on the infinity side (-)
Position equal to the image plane of the camera.
Optimum focus
Focus Lens Group
CCD A for PF CCD B for PF
Move to nearside | Contrast | |
Motor |
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Contrast value of CCD A is lower than CCD B.
Focus on the infinity side. Lens focus will move toward the nearside.
USER FRIENDLY
PF CONTROLLER
The new focus controller for Fujinon’s exclusive Precision Focus Assist provides operators with a simple to use yet powerful tool to maintain precise focus in the most demanding production situations. The familiar manual type focus controller has been adapted to encompass all of the precise servo features of the PF lens.
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