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Post by Deleted on Aug 8, 2014 11:12:46 GMT
I recently managed to get hold of a couple of nice f0.8 DC auto-iris lenses. Ideally, I'd like to able to use them with my Watec 902H, but the 902H isn't compatible with DC auto iris lens, just video auto iris. The obvious answer is a DC auto-iris to video iris converter. The trouble is the only converters I've found (Avalonix SVLC12VT and Pelco LDC100) are both discontinued. The few places I have so far found that appear to have stock are in the US and won't ship th the UK
Has anyone know where I can get one?
Thanks
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Post by Deleted on Aug 8, 2014 13:02:13 GMT
That's all I could find also! They seem discontinued, as most cameras now can do both.
Good luck
Hemmi
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Post by Deleted on Aug 9, 2014 2:01:47 GMT
I recently managed to get hold of a couple of nice f0.8 DC auto-iris lenses. Ideally, I'd like to able to use them with my Watec 902H, but the 902H isn't compatible with DC auto iris lens, just video auto iris. The obvious answer is a DC auto-iris to video iris converter. The trouble is the only converters I've found (Avalonix SVLC12VT and Pelco LDC100) are both discontinued. The few places I have so far found that appear to have stock are in the US and won't ship th the UK Has anyone know where I can get one? Thanks Hi,
There is an easy fix, I have many such fixed focal length lenses, here are a few of the good auto iris lenses by Computar, Fujinon, etc, in various options, intended for use with C mount video cameras with a 4-pin socket to connect to the lens. NOTE* However, the pin arrangement is not standard between makes. so one has to do a search to find the circuit which describes the pin connections. Usually red is positive, black is negative power DC the other/s are signal, iris open etc. My Zoom lenses have more leads for different functions and need the manufacturer's data sheet to know which does what. I overcame the auto iris problem many years ago by using a 12 Volt N icad pack and adding a connector to the Pos & Neg wires from the lens, this when applied opens the lens to max aperture, which is where we use them anyway if used for all sky meteor work. A switch on the connection makes turning the power to the lens on/off easy. Check your lens connections and supply voltage and at your own risk, I take no responsibility for any smoke tests. *Note, I was using video gear for medical & scientific work as well as astro use from the late 1980's, so gathered a lot of gear along the way, including lenses and other handy gear no longer manufactured, but highly desirable for astro use such as the fast f/0.75 & F/0.8 Aspherical lenses made by some high end manufacturers. In those days the video camera s were so much less sensitive and using a faster lens was the way to go.Clear Skies... Shevill
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Post by Deleted on Aug 9, 2014 13:40:18 GMT
That's interesting to know Shevill. I have a couple of auto iris lenses here. If I can open the iris at the flick of a switch, it would make them usable. Maybe they could work on a timer that will close the iris when the sun comes up.
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Post by Deleted on Aug 10, 2014 3:17:09 GMT
That's interesting to know Shevill. I have a couple of auto iris lenses here. If I can open the iris at the flick of a switch, it would make them usable. Maybe they could work on a timer that will close the iris when the sun comes up. Hi, I do this by using a mains DC regulated power supply plugged in to mains cable/socket which has a light sensitive (selenium cell whatever) that turns the power off at dawn and back on at dusk, too easy. Once the regulated mains power unit is not powered, the iris closes. Over the past 15 years I have used all sorts of trick for my commercial sky cams, most of which work the opposite way, on during the day, off at night, except my own where I have both in operation. A regulated DC plug pack connected to the mains socket output, when it is on at night, the camera is on & lens open etc.
A Selenium or other light sensitive cell can be seen, as well as a red LED to show when power is on. Various settings can be selected via the control.
Clear skies...
Shevill
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