heu Michel, la transmissivite des filtres Lee CE30R, c'est du genre 75% ?
sinon pour revenir aux histoires de temp. Kelvin, que penses-tu de ce que dit elken, le guru des lampes du forum lumenlab ? il bosse dans l'installation de VP de cinemas depuis 30 ans
http://www.lumenlab.com/forums/index.ph ... ntry166760
another point about colour temp Kelvin
every industry works on a different range,, and TV has evolved over the years with difffernent standards too, and they have pushed the blue end of the temp range, because it suits them,, all display units on sale in showrooms are driven over at a high temp range, because it looks better than a correctly adjusted one, much in the same way they use a particular MH lamp for butchers, to highlight the false red colour of meat..
so dont think that 6500k is the perfect temp,,, it isnt,, it has all been driven by marketing, to a large degree
the reason 6500 was choosen is because in the early days screens were, dimmer, and the blue end was bright, so hence it is a relic of our past,, you can achieve correct greys at several points on the Kelvin,,, the trick is you have to know what to adjust WHERE,, and when..
its not just a simple bright/contrast/saturation set of adjusts,,,, to get right balance,,,
now I am not accurate on the next point but it is indictative only
but TV is driven or used to be driven towards 6500,, more so now at 5400,, ,most film makers use temps of around 4200k etc,, so its the media you have to look at and how it relates to what you are using etc..
now lets take an LCD monitor,, its backlight is tuned for max brightness according to that formula, it is best at 6500k because of its backlight,, and for its orignal use, which is purely a computer display this works fine,,, ahhh but introduce a different source media,,,, MOVIES,, have you not wondered why they are dimmer than everything else, apart from the fact they have millions of complex colour mixes over a PC screen,, they are based on a different temp scale
however what I have stated is really much much more complex than the simple description i have put up
lui il considere que 6500K est tout sauf le saint-graal.........surtout que c'est la temperature qd on additionne tous les spectres........donc ca ne veut rien dire en fait....
et l'important est d'avoir une balance de gris la plus parfaite possible, et on peut l'atteindre a n'importe quelle TC
et bcp de films sont "shootes" environ en 4200K d'apres lui...........raison pour laquelle je trouve l'image bcp plus cinema avec une lampe 4200K et trop "data" avec du 6-7000K ?