harry dalek wrote:You might be able to house the lens in large PVC pipe cut to size they come in many sizes so you might be lucky for a good fit ? I can see Troy off to the hard ware store .
Are you going to make the circuits with modern day electronics as it might just be much easier to use valves and copy the old designs might speed things up ...there must be a few circuits out there for it ?
I am not sure if you have valves but ?
Klaas Robers wrote:I don't understand why you placed three magnifying glasses in row. Then you get a focus distance that is too short to my ideas. The result will be that the aspect effects on a TV are bad.
In principle a camera should have the same opening arc as the viewers eye when watching the TV. For TV this arc is choosen to be 10 degrees in the vertical direction. Then the TV lines become just invisible.
This implies that the viewer should sit at 5.7 x the picture height from his screen. This also implies that the taking lens should be 5.7 x the height of the camera target. So the focal distance should be the same. I have the impression that one of your magnifying glasses fulfills this criterium almost, may be it is already somewhat too close to the target.
An extra advantage is that due to the smaller viewing arc, optical errors in your lens are less prominent visible, so you get a sharper picture. And then darken the space between the lens and your screen and look at the frosted transparent screen from the back side.
Succes.
Steve_McVoy wrote:Very nice work.
I have worked with the 1846 in the 1942 military camera it was originally used in:
http://www.earlytelevision.org/rca_airb ... amera.html
Unfortunately, these tubes are very often gassy, so good luck with yours.
One other point. You will need to build your line deflection circuit with a trapezoidal signal at the frame rate to make the scanning illuminate the ike target properly. You can see how it was done in the original camera in the schematic diagram in this article:
http://www.earlytelevision.org/pdf/cq_5-57.pdf
Good luck with your project.
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