mirjanarukavina

<p>personally I think this is a mostly trival, boring and dull topic. to me dublicating retro is as boring as the technical level of digital imaging and lighting.<br /> <br /> a continuous light is not a pulsed light source (e.g. xenon flash).<br /> <br /> for some nice illustrative pictures see e.g. slides 14, 15, 20, 21 in this presentation:<br /> http://www.physics.gatech.edu/gcuo/UltrafastOptics/OpticsI/lectures/OpticsI-23-Ultrafast%20Optics.ppt<br /> <br /> or if you prefer some nice short-story, e.g. wikipedia has one:<br /> http://en.wikipedia.org/wiki/Dispersion_(optics)#Group_and_phase_velocity<br /> <br /> so always funny to hear some typical photographer statement like this:</p>

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<p>"You don't have to use tungsten fresnels to re-create Hollywood style stuff, grid spots or standard reflector with barndoors/snoots for strobes can do the same spot lighting effects."</p>

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<p>Of course vintage fresnels are not very hi-tech [0], their washed-out rather "soft-spot" luminous intensity distribution looks roughly like this: http://en.wikipedia.org/wiki/File:Laser_gaussian_profile.svg<br /> <br /> Based on this washed-out "soft-spot" effect some photographers constantly think this is the very same as the washed-out "soft-spot" of a xenon-flash. However sometimes it does looks quite similar.<br /> <br /> Since this is a complete vintage/retro thread i will try my best not to be off-topic and therefore conclude with the immortal Richard Avedon statement: "I think all art is about control - the encounter between control and the uncontrollable."<br /> <br /> <br /> [0] random examples what is technical standard today, cf. e.g. http://www.highspeedfilm.de/dedocool.html or http://www.etcconnect.com/product.overview.aspx?ID=20254, etc.<br /> <br /> <br /> ps: a related recent and IMO interesting - albeit german - discussion: http://forum.fotografr.de/topic/einsatz-von-dedolight#post-296</p>

<p>"Here's a sample of various brands of lighting to show how prints and other objects render under them as my eye sees it, not how the camera's processor renders it." <br /> <br /> mmh, so your eye (which one BTW) outputs a JPEG [0] !?<br /> <br /> Tim Lookingbill, are you a cyborg ? ;-) SCNR.<br /> <br /> <br /> [0] http://static.photo.net/attachments/bboard/00S/00SO54-108857584.jpg</p>

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<p>I've been told that the late Ed Bradley, a member of the "60 Minutes" reporting team, and his camera man figured out that using the SoLux bulbs were the best match for Bradley's skin tones.</p>

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<p>as usual an excellent Ellis Vener posting which is not just full of insight but also makes you reflect and think about the why and how and what.. :)<br /> <br /> * von Luschan skin-tone scale and the problem of consistent color matching..<br /> http://en.wikipedia.org/wiki/Von_Luschan's_chromatic_scale<br /> <br /> * meat display lights are usually 3500 Kelvin <br /> http://www.osram.com/osram_com/Professionals/General_Lighting/Fluorescent_lamps/Product_overview/T8_fluorescent_lamps/Special_lamps_T8/NATURA_T8__NATURA_SPLIT_control_T8/index.html<br /> <br /> <br /> ps: JFYI Phillips Diamondline is Solux licensed technology and ofttimes easier to get in Europe.</p>

<p>Hi Nathan,<br /> <br /> Sorry I don't neither really understand your posting nor most of the replies so far. e.g. "<em>all emit a non- continuous spectrum, now its my understanding that breaks in the spectrum translate to colors being rendered visually incorrect. My understanding is that in principle a light that is missing part of the lower (redder) spectrum might render an orange object to look more yellow, ...</em> " makes me realize why I strongly prefer sound science to the pseudo-sci-bla-bla many photographers use as their ego-boost lingo.<br>

<br /> <br /> Here's my linguistic quickie: We can data-model the given issue as a formal game-theoretic signaling game with two nodes and a uni-directional edge btwn. these two node. One node is the light source with a certain CCT (corr. color temp.), while the other node is the receiver (e.g. human eye, CMOS imager, CCD sensor, yada,yada...)<br>

<br /> Spectral bandwidth is set to VIS spectrum, light source SPD (spec. power dist.) should match a theor. black body radiator, imager spectral sensitivity [1] should match a usual theor. model of human visual perception [2].<br>

<br /> :)</p>

<p>HTH, mirjana</p>

<p>[1] http://delicious.com/mirjanarukavina/imager+spectral+sensitivity<br>

[2] http://en.wikipedia.org/wiki/Colour_vision#Physiology_of_color_perception</p>