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Take the computar H2Z4516CS-2 lens which has three adjustable rings as an example:
"OPEN" and "CLOSE" are marked on the aperture ring, and the aperture ring can be directly
rotated to adjust the aperture; "OPEN" means increasing the aperture, and "CLOSE" means
decreasing the aperture. In the environment with weak light, increase the aperture to improve
the viewing effect; in the environment with ample light, properly decrease the aperture, so that
the screen will not turn white. In addition, increasing the aperture makes the depth of field get
smaller, and decreasing the aperture makes the same get larger.
A locking screw is set for the zoom ring and focusing ring respectively. Before adjustment,
rotate the screw anticlockwise, so that the zoom and focusing rings are in the adjustable state;
after adjustment, properly lock the screw.
"W" and "T" are marked on the zoom ring, and mean "WIDE" and "TELE"; adjusting towards
the "W" direction increases the view angle of the lens to the maximum, so "W" means wide
angle; adjusting towards the "T" direction decreases the view angle, and thus farther views can
be seen.
"∞" and "N" are marked on the focusing ring, and mean "Infinite" and "NEAR" respectively;
focusing is adjusted as per the distance (i.e., object distance) of the observed view, till the
scenery is clear.
Please don't touch the surface of the lens when operating it, and please clean the dust or
pollutants (if any) on the lens with special cleaning cloth.
Appendix II: Use of Desiccant
The desiccant bag is included in the accessories packed along with the product. Place
the desiccant in the equipment cavity after installation and electrical connection of the
equipment. Please pay attention to the placement position: keep away from driving
and electrical connection parts, and be relatively static and tight, so as to avoid the line fault
or driving fault due to absorption saturation of the desiccant.
SVEX-T500A Explosion Proof Camera User Manual.
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