Hitachi HV-D25 operation manual Lens selection

Lens

Note when choosing the lens

The figure indicates the limiting dimensions of the lens mounting structure. Use care, since an improper lens fitting can damage both the lens and the camera.

1)The C mount threads must be less than 4.2 mm from the flange plane.

2)An 18 mm diameter segment of the lens optical axis center must be must be less than 3.8 mm from the flange plane.

Lens selection

1)Optical characteristics

The proper lens is vital for obtaining full performance from the camera. The exit pupil distance is particularly important for a 3 CCD type camera. If too short, vertical color shading can appear in the picture.

Also, as the lens iris approaches fully open, problems such as loss of resolution, shading and flare (overall image "white-out") can detract from picture quality. When using in applications that call for open iris, the following lenses are recommended. If another lens is contemplated, check the performance beforehand.

Maker	Lens type	Rating
Cosmicar	H20ZAME-R	7.5 - 75 mm F1.2
	C10ZBME-R	10.5 - 105 mm F1.4
Fujinon	S10× 8DB-SNDS21	8 - 80 mm F1.6
Canon	J7× 10BCMAS	10 - 70 mm F2.1

2) Auto iris lens

Main types are Video (with self contained iris amplifier) and DC (DC voltage applied to open lens iris) and manual over-ride (e.g., Cosmicar). Lenses without self-contained iris amplifier are not compatible.

Camera settings differ according to the auto iris lens type (see page 23).

Note:

The HV-D25 uses lens connector wiring prescribed by the EIAJ (Electronic Industries Association of Japan). Refer to page 48

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