FUJINON Introduced New Zoom Lenses for HD Broadcasting with Autofocus System Built in

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FUJINON Introduced New Zoom Lenses for
HD Broadcasting with Autofocus System Built in

Fujinon introduced the world’s first high definition TV zoom lenses “PRECISION FOCUS* ” with the autofocus system incorporated in NAB 2004 held in Las Vegas, USA, from April 19, 2004.

* “Precision Focus System” is the unique autofocus system that has been developed for high definition broadcasting jointly by Fuji Photo Optical Co., Ltd. and NHK (Japan Broadcasting Corporation) for the first time in the world. Our Precision Focus System recently received “Technology Development Award” of Motion Picture and Television Engineering Society of Japan, Inc., and is highly evaluated for its advancedness in the broadcasting industry. We have incorporated this unique system in two zoom lens models DIGI POWER 101 and DIGI POWER 13, and will expand the Precision Focus lineup according to market needs.

1. Main features of the zoom lens with Precision Focus System incorporated
	*	The world’s first autofocus broadcast zoom lenses that meet an increasing requirement of fine focusing for high image quality in the high definition broadcasting
	*	The Precision Focus System allows easy and quick confirmation and adjustment of focus on the lens finder, and can demonstrate its excellent capability in live broadcasts.
	*	The autofocus lens can bring a fast-moving object into focus, and can be a reliable supporter in sports broadcasts of soccer games, track and field events, and so on.
2. Background of development of Precision Focus
		Since the start of satellite broadcasting and digital terrestrial TV broadcasting, high definition programs with high quality images have been increasing in number. So, strict focusing conditions are more required in shooting sites, while confirmation and adjustment of fine focusing on the lens finder have been virtually impossible. The Precision Focus System has been developed to address the pressing needs of videographers for easy and quick fine focusing on the lens finder.

3. Summary of Precision Focus models
	(1)	Product name: Precision Focus
	(2)	Models with the Precision Focus System built in :
			The world’s highest magnification zoom lens DIGI POWER 101
			The world’s widest power zoom lens DIGI POWER 13

(3)	Specific features
	*	Quick assistance in focus confirmation and adjustment
		In high definition shooting with a limited range of being in focus, a videographer often feels not confident of a shooting object being really in sharp focus. The Precision Focus gives a definite assistance to the videographer by confirmation of being in focus and quick, automatic correction of being out of focus
	*	Simple setting of a focusing position at any objects
		TV program production often requires some objects not in the screen center to be brought into focus as an effective presentation. To meet these needs, we have provided these new lenses with a function to set a focusing position at any objects within the field of view. The setting can be performed by a simple operation of a square frame on the view finder by a controller.
	*	Capable of capturing a rush-coming object in sharp focus
		It is extremely hard to keep a rapidly and constantly moving object in sharp focus during soccer games and track and field events. The Precision Focus lens can trace an object coming close or going far at a great speed all the way in exact focus.

4. Principle of Precision Focus
	The Precision Focus has been developed to have a contrast control system utilizing a characteristic that an image contrast becomes the highest when an object is brought into complete focus. The system has a unique mechanism with two CCDs for focus detection in addition to the CCD for shooting to control a zoom lens focusing so that the contrasts of the two images generated by the two CCDs may match each other. This control function keeps a fast-moving object in constant focus.

	CCD A and CCD B are arranged in the lens at an equal distance from the image-forming plane to detect the focusing conditions at the front and the back against the camera image-forming plane.	The crossing point of the contrast value curves of the images generated by CCD A and CCD B is the best focus position of the camera.

5. Specifications

Model		DIGI POWER 101 with Precision Focus built in
Camera		2/3”
Focal length	1×	8.9 - 900mm
	2×	17.8 - 1800mm
Zoom ratio		101 ×
Extender		2 ×
Maximum relative aperture	1×	1 : 1.7 ( 8.9 - 291mm ) , 1 : 4.7 ( 900mm )
	2×	1 : 3.4 ( 17.8 - 582mm ) , 1 : 9.4 ( 1800mm )
Minimum object distance ( M.O.D.)		2.9m
Object dimensions at M.O.D.	1×	8.9mm 2865 × 1610mm
		900mm 28 × 16mm
(horizontal × vertical)	2×	17.8mm 1433 × 805mm
		1800mm 14 × 8mm
Angular field of view (horizontal × vertical)	1×	8.9mm 56°38' × 33°42'
		900mm 0°37' × 0°21'
	2×	17.8mm 30°09' × 17°13'
		1800mm 0°18' × 0°10'
Macro		Minimum shooting distance: 0.3m
Total length		252 × 252 ×720mm
Mass		24.7kg
Operating system		Servo / manual

Model	DIGI POWER 13 with Precision Focus built in
Camera	2/3”
Focal length	4.5 - 59mm
Zoom ratio	13 ×
Maximum relative aperture	1 : 1.8 ( 4.5 - 39.2mm ) , 1 : 2.6 ( 59mm )
Minimum object distance ( M.O.D.)	0.3m
Object dimensions at M.O.D. (horizontal × vertical)	4.5mm 723 × 406mm 59mm 56 × 31mm
Angular field of view	4.5mm 93°38' × 61°50' 59mm 9°18' × 5°14'
Macro	0.05m
Filter thread	M127 × 0.75 ( attached to hood )
Iris operation	Servo or manual
Zoom operation	Servo or manual
Focus operation	Servo, auto or manual
Mass (without lens hood)	Approx. 2.9 kg

Images
DIGI POWER 101 with Precision Focus built in
	JPEG : 516 KB JPEG : 192 KB TIFF(LZW) : 1.75 MB
DIGI POWER 13 with Precision Focus built in
	JPEG : 454 KB JPEG : 234 KB TIFF(LZW) : 1.73 MB



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