Hitachi HV-D25 - Manual (Page 19)

6
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
Fujinon
Canon
H20ZAME-R
C10ZBME-R
S10 × 8DB-SNDS21
J7 × 10BCMAS
7.5 - 75 mm F1.2
10.5 - 105 mm F1.4
8 - 80 mm F1.6
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