If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
color temp for halogens
I have a few halogen shop lights that I am thinking about using for some
portrait work (background, hairlight) and I am curious if this is a good idea. I am using 35mm negative, not digital. In one case I want to use them in my studio, which would be a combination of those two halogens, plus my Canon 420ex for fill. Are these all the same temp? In the second instance, I want to drag them to some location work that I am doing and using them in daylight. Am I looking for trouble? Has anyone ever done this?? thanks |
#2
|
|||
|
|||
color temp for halogens
I have a few halogen shop lights that I am thinking about using for some portrait work (background, hairlight) and I am curious if this is a good idea. I am using 35mm negative, not digital. In one case I want to use them in my studio, which would be a combination of those two halogens, plus my Canon 420ex for fill. Are these all the same temp? In the second instance, I want to drag them to some location work that I am doing and using them in daylight. Am I looking for trouble? Has anyone ever done this?? halogen is basically the same as tungsten, and would give you a very warm yellow orange color cast. however, the juxtabosition of the two can be interesting. shoot vertically, aim your flash to bounce off a sidewall. Use the halogens for background and hair light. You'll need a tripod for this. set your f/stop for as minimal as you can, shoot wide open if needed, and you'll need a very slow shutter speed, 1/15th would be lucky, you could end up 1/8th 1/4th. If you have a hand held meter, you want to get the background to be one stop under what your subject exposure will be. keep in mind, 100 watt seconds, a rating of a flash power, is the equivelent to a 100 watt incandescent bulb for one full second. So do the math to get a decent exposure at 1/15th, that's four stops and each stop doubles the required out put, 2, 4, 8, 16 100 watt bulbs. |
#3
|
|||
|
|||
color temp for halogens
Doug writes:
I have a few halogen shop lights that I am thinking about using for some portrait work (background, hairlight) and I am curious if this is a good idea. I am using 35mm negative, not digital. If you filter for it and/or use tungsten film, it's not much of a problem. Color casts can also be corrected after principal photography in Photoshop, but that's an inferior solution to filtering or otherwise compensating at the time of exposure. Halogen lamps have a higher color temperature than ordinary light bulbs, since their filament temperatures are higher. But they are still quite orangish-red compared to daylight. In one case I want to use them in my studio, which would be a combination of those two halogens, plus my Canon 420ex for fill. Are these all the same temp? Flash units typically produce daylight color temps until you put filters over them. Mixing them unfiltered with halogen light will make proper balance impossible, although the effects may or may not be acceptable. In the second instance, I want to drag them to some location work that I am doing and using them in daylight. Not a problem in daylight, as flash units are already balanced for that. -- Transpose hotmail and mxsmanic in my e-mail address to reach me directly. |
#4
|
|||
|
|||
color temp for halogens
On Tue, 09 Mar 2004 01:31:53 GMT, "Doug" wrote:
I have a few halogen shop lights that I am thinking about using for some portrait work (background, hairlight) and I am curious if this is a good idea. I am using 35mm negative, not digital. In one case I want to use them in my studio, which would be a combination of those two halogens, plus my Canon 420ex for fill. Are these all the same temp? In the second instance, I want to drag them to some location work that I am doing and using them in daylight. Am I looking for trouble? Has anyone ever done this?? thanks Color temp of the usual halogen 120V non-photo lamps is about 2800-2900K. Visit any of the websites of the leading lamp suppliers for details. |
#5
|
|||
|
|||
color temp for halogens
On Wednesday 10 March 2004 07:10 pm, KBob wrote:
On Tue, 09 Mar 2004 01:31:53 GMT, "Doug" wrote: I have a few halogen shop lights that I am thinking about using for some portrait work (background, hairlight) and I am curious if this is a good idea. I am using 35mm negative, not digital. In one case I want to use them in my studio, which would be a combination of those two halogens, plus my Canon 420ex for fill. Are these all the same temp? No! Halogen shop lights are around 2800K, while your flash is around 5500 to 6000K. Mixing them or the halogens with normal daylight is not a good idea -- colorwise. Won't make any difference with black and white. Mixing flash and daylight is okay. In the second instance, I want to drag them to some location work that I am doing and using them in daylight. You're going to have color problems. See if you can buy some Rosco Industries "Booster Blue" filters (www.rosco.com) to balance the halogens to around 5000 to 5500K. You're shooting daylight balanced film, so all light(s) has to be balanced, more or less, to "Standard Daylight" to get acceptable results. Theatrical lighting and movie supply houses have all kinds of filtration media for all kinds of light sources. Am I looking for trouble? Has anyone ever done this?? Yes. And Yes. I shot architectural interiors for years, professionally, and had to deal constantly with "mixed" light sources. For the most part, you can compensate, you just have to know what you're doing. The Rosco website's Technotes area is a good place to start learning. Also, find and read as many books as you can find on photographic lighting techniques. thanks Color temp of the usual halogen 120V non-photo lamps is about 2800-2900K. Visit any of the websites of the leading lamp suppliers for details. -- Stefan Patric |
Thread Tools | |
Display Modes | |
|
|