[photo-3d] projector brightness

["georges belieres" <georges.belieres@xxxxxxxxxx>]

Regarding the questions from Dan Wenz, I think J. Rupkalvis gave full replies.However, 3 remarks :
 1. the voltage across the Q.I. lamp filament is critical - as was said- and one way to control it remains within + - 5per cent to the nominal value, consists in using one (or two) transformer fitted with several mains entries:110,115,120V, and choose the best ,according to the reading of a small meter connected to the filament.
2. I think the process of adjustment of the lamp by respect to the spherical mirror, given by J.R.is hazardous, because superimposing the 2 images of the filament risks to create overheating to it.
 I want to mention the articles written in ' 89 by Stan Speel and Colin Clay (Stereoscopic Sty) in which you can find full details about :adjusting projection lamps, cooling, screen brightness and so on . They recommand to adjust the position of the lamp in such a way that the primary image of the filament and the reflected image take place one above the other, with egal dimensions.These two images "fill" or "light" a larger surface on the pupil of the lens, and consequently, provide a better optical efficiency of the light beam.
3. Cooling is another problem: as was said, cooling the lamps must not be too strong, but cooling the slides is essential. The fan ( 115V generally) can be replaced by a modern model, more silent. 
Those who are interested may ask these articles: bulletins n° 103,104,105,106 to the Stereoscopic Sty, because i have no scanner at the moment !
     


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