 Dick Speer |
lens color correcting filters
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Morgan W. Bird |
yes, there is. You probably want an 80A filter (blue). however that may be hard to get for a digital. The filter size is something like 37mm, which is pretty rare. I think Tiffen makes some.
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Morgan W. Bird |
Oh, and of course, since it's digital you can always just correct a color cast on your computer, rather than using a filter. Photoshop, Photodeluxe, and lots of other will all do that pretty easily.
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John A. Lind |
Dick, Morgan's suggestion may get you closer to what you need than without any filtration. However, an 80A corrects tungsten to daylight, not high pressure sodium vapor lamps. The problem with high intensity discharge lamps is their spectral characteristics. They give off huge spikes of no more than just a few very narrow wavelengths . . . unlike tungsten which is heavy in red and yellow but has a curve to it that falls off rapidly toward blue. Because of this, high intensity discharge lamps such as these and mercury vapor are nightmarish to color balance. There can be noticeable variation in what filtration is required depending on manufacturer and model of lamp also. If simply an 80A doesn't work well, Kodak makes the following recommendations for correcting the G.E. Lucalox to daylight, for several different films. This is a specific model of high pressure sodium vapor lamp. These are Wratten filter numbers, a standard numbering scheme: Most color negative films and Kodachrome 64: Daylight Ektachromes and Kodachrome 25: Kodachrome 200: I recommend trying these combinations in the order given. -- John
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Dick Speer |
Thanks for the helpful hints. I tried correcting this with the digital image software that comes with microsoft office apps. unsuccessfully. I'll try Photoshop and some of the suggested lens filters. I apologize for the delayed response. For some reason my MSN email software puts this news letter in my bulk mail folder along with many unscrupulous emails that I normally ignore to avoid the pornography and viruses. I moved the last one to the inbox to see if this would correct the problem.
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