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holtzman wrote:There are two fundamental obstacles for it to work properly.
First, the film contrast. I learned - from this forum - that no film is sufficient to give 99.99% black as required for NBTV.
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holtzman wrote:Second, the disc mounting on a shaft. Even if you manage to make an accurate disc, its center must be drilled by exactly the same diameter as the shaft and exactly in the holes spiral's center. With dimensions you are talking about, it's very challenging...
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holtzman wrote:Anyway, if you overcome these obstacles, it will be very interesting to try to PROJECT your spinning disc image on a small screen. I have been thinking about it quite a while. Because high power leds are so bright, and their light is concentrated to such a small area, they can act just like a light source of a slide projector, diffusor included. So there may be enough light for a 2" screen! It may be a substitute for a lens disc.
holtzman wrote:- that no film is sufficient to give 99.99% black as required for NBTV.
gary wrote:aaah, but the external sync?...
gary wrote:I take it there is no (obvious) access to the digital connections at the back?
kareno wrote:A while back I made a Nipkow disk out of OHP transparency. I wouldn't recommend that for this situation because the printer resolution (600pdi) was only just adequate for my 20cm (8inch) disk.
What I can suggest is a way of overcoming, to a large extent, the problem of light seepage through the black areas. I made a second disk of an opaque material and punched the holes with a leather punch. Fixed together with the transparency disk, the transparency-defined holes were visible though the punched holes, leaving a relatively small area of blackened transparency.
This greatly reduces the light seepage. The result is theoretically a bright, sharp image defined by the transparency apertures, overlaid with a dim, blurred image defined by the punched holes and the black transparency that shows through them.
This worked well. It is the same disk I used with my camera converter:
http://www.taswegian.com/NBTV/forum/vie ... php?t=1306
Viewmaster wrote:gary wrote:I take it there is no (obvious) access to the digital connections at the back?
No Gary I don't think there are. Just the power socket and two phono plugs.
One is connected to the monitor but there is no info in the little instruction book as to what the other is for, although it states that the camera provides audio function so I guess it's for audio o/p, but no sign of a mic.
Although the booklet states that various lenses are available and infra red can be added there is no manufacturer info ( Name/address/phone number)..........the inscrutable Chineese!
But for £5 it does what I want it to do, so I am well satisfied.
Gary, for digital connections you will need something like this at a pricey £9 !! ................
http://www.ebay.co.uk/itm/200459396933? ... 1436.l2649
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