Archived posting to the Leica Users Group, 2002/02/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]le 27/02/02 21:31, Henry Ting à henryting10@yahoo.com a écrit : > > Question on artificial lighting. > Take for example a night game of basketball, baseball, > or horse-racing, is there a definitive way to tell > whether its tungsten lighting, mercury lighting or > otherwise without having a color-temperature meter ? > Can I assume that these lightings are close to 3200K ? Absolutely not Basically there are two families: "warm" yellowish" tungsten lighting just has not enough power to light big sport areas. You will find it in theaters, music halls or so. "cold" white/greenish/blue lights are for big areas. We won't speak about orange monochromatic iodure lighting... In Europe, sport lighting is often made for TV with HMI (high temperature metal iodure or so) lighting close to daylight. Mercury and fluorescent lighting seem often close to daylight but with a non continuous spectrum which often gives a green cast. Here is the real pb, and the only way to measure it is a thermocolorimeter. They are as many filtering combos as lighting manufacturers (filters on a magenta basis, Kodak CC30M is often a good starting point). Be aware you will loose from one half to one and a half stop. To my personal opinion, filters are useful mainly for reversal. Please consider that modern negatives are less sensitive to color temperature. For fluorescent/mercury lighting, "Reala type" Fuji negatives like "4th layer" Superia can easily be corrected by the labs during the printing process (don't forget to tell them). For night sports photography an "XTRA" or "SUPERIA" 800 (only the commercial name changes) will probably be the best. But never underexpose! Hope it helps. Best regards. Didier (Paris) - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html