GunRunner1 0 Posted August 10, 2007 I have a 1:1.2 computar h10z0812amsp 8-80mm. With zoom & focus power adjustment swithes. I hooked it up to a Toshiba box camera inside and everything worked good. I set it up oudoors and the screen is completly white. If I put my hand in front of the lense I can see my hand. Is it to bright outdoors? Can I get some type of filter or what I plan to use it oudoors. It has a 6' cord for the control that has a 9 volt battery in it. Can I exrend those wires? Do they make extention cables? Any other info on zoom lense's this is my first one bought it used. Will this lense work with ir led lights? Share this post Link to post Share on other sites
survtech 0 Posted August 10, 2007 Did you hook up the iris connector? It is a video auto-iris lens (as opposed to a DC auto-iris lens) so the camera must have a setting for the lens type. Share this post Link to post Share on other sites
GunRunner1 0 Posted August 10, 2007 yes I plugged in in the camera. Share this post Link to post Share on other sites
survtech 0 Posted August 10, 2007 You still have to make sure that the camera can provide the proper signal for a video auto-iris lens. Most modern lenses are DC auto-iris so a camera that doesn't have a separate iris connector for each type or a switch labeled "Video / DC" or something similar will most likely only handle DC auto-iris lenses. If the camera is capable of controlling video auto-iris lenses and is not doing so, there may be a problem with either the iris motor or the control circuitry. Most likely the former; they can get "stuck" in one position. Share this post Link to post Share on other sites
GunRunner1 0 Posted August 10, 2007 The switch is on d.c. and i changed it to vidio and back to d.c. Its still don't work. Is there something I can do to fix it? Share this post Link to post Share on other sites
Metal Shaper Man 0 Posted August 10, 2007 I have a camera with a DC level control and/or adjustment that whites out or greatly darkens the picture. Could that be something he should look into? Share this post Link to post Share on other sites
GunRunner1 0 Posted August 10, 2007 I tried it on a different camera and it works. Now I have to figure out if it will work with ir lights. do you know? Can I etend the control cable if so how far can I extend it? Thanks, Share this post Link to post Share on other sites
survtech 0 Posted August 10, 2007 (edited) The switch is on d.c. and i changed it to vidio and back to d.c. Its still don't work. Is there something I can do to fix it? That lens is a video auto-iris. It will not work if the switch is in "DC". If it does not work with the switch in video, most likely the iris motor is bad or the iris control circuitry in the lens is fried. I have a camera with a DC level control and/or adjustment that whites out or greatly darkens the picture. Could that be something he should look into? No. The DC level control is only for use with DC auto-iris lenses, not video auto-iris lenses. A video AI lens has circuitry inside to control the iris motor. That circuitry samples the raw video from the camera and uses the signal to control the motor that opens and closes the iris. A video auto-iris lens requires power and baseband raw video signals from the camera. A DC AI lens has no circuitry. The camera contains the sampling and control circuitry and just puts out a varying DC voltage directly to the motor that controls how far the iris is open. The following is paraphrased from http://www.rapitron.it/guidaobaiE.htm Video auto iris lenses have two potentiometers - ALC and Level. Both settings are adjusted by the manufacturer at a default value which is good for most applications and thus no further adjustment is usually needed. ALC (Automatic Light Compensation) is a photometric adjustment of the iris and can be considered similar to the backlight compensation usually found in a camera. It sets the signal reference level according to the contrast of the image and it has two ends: Peak and Average. Very bright points on the image make the iris closing and any dark object will be even darker and sometimes too dark to distinguish any detail. In this case we may adjust the ALC in order to make the iris open more than usual (setting towards the Peak position). On the contrary when it is necessary to see better the bright points the ALC will be set towards the Average position in order to make the lens closing more than usual. It should be noted that the ALC setting will be effective only with high contrast scenes. Level is a sensitivity adjustment to the video signal changes and shows two end positions: H (high) and L (low). By turning the screw towards H the image will be brighter and consequently will be darker when turning the screw towards H. Setting the Level you should take care that the image is acceptable both in daylight and in night operations. Both settings should be made always with AGC=Off. Here is a link to the specs of that lens: http://www.cbcamerica.com/cctvprod/computar/zoom/zoompdf/H10Z0812AMSP-2.PDF Edited August 10, 2007 by Guest Share this post Link to post Share on other sites
Metal Shaper Man 0 Posted August 10, 2007 survtech, I don't have a lot of experience with a wide variety of equipment. Thanks for the valuable iformation. Share this post Link to post Share on other sites
