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#21
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Ghosting Problem
quote who= Alan Browne /:
You have to think of both exposures seperately and then find where the aperture works for both exposures. Ok, I get it. Thanks Alan. J -- Justin F. Knotzke http://www.shampoo.ca |
#22
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Ghosting Problem
"Justin F. Knotzke" wrote in
: quote who= Alan Browne /: Justin F. Knotzke wrote: for the background, close the aperture by 1-2 stops and increase flash by 1.5 stops. I'll probably darken out some buildings and backgrounds but my subjects should come out better and not look like Casper's cousins. If you increase the flash you will whiten them out and kill any color they are wearing... esp. on slide film. But wouldn't the descreased exposure compensate for that? Depends on how exactly you're determining exposure. If you're metering from ambient conditions with the intent of dragging the shutter for those nice blurs, and the flash is TTL, then no flash compensation should be needed. You still have to be careful and meter the sky, to make sure it isn't overexposing at your camera settings, which will blow out the film, and the flash will only pile on top of this. If you're determining flash exposure by hand, remember that exposure is cumulative. In other words, the flash by itself might be fine, and the long exposure by itself might be fine, but the two together may equal blowouts. So anything light colored that gets exposed by the flash, in an area of the film already exposed by the sky, will go absolutely nuclear. Once you pass the limits of the film, nothing you can do will bring it back. You can't increase the flash to make the overexposure "even" across the board - the film is already saturated. All you'll do is saturate those areas that hadn't been. You have to drop overall exposure down to the film limits, and this means decreasing both ambient exposure and flash. It's much the same as a double-exposure. In order not to overexpose the film, you decrease each exposure by a stop or so, because they'll pile on top of one another. You're doing the same thing here - consider the ambient blur exposure, and the flash going off, two separate exposures. It's up to you to judge the conditions to know how they'll combine - obviously the sky is a problem. So is anything white against white in the two (good luck judging where the white helmet of a cyclist is gonna fall as they race past you! ;-)). Very tricky, and I agree with the others that a dark background is going to be your best bet. Good luck with it! Get it right and the pics should be excellent! - Al. -- To reply, insert dash in address to match domain below Online photo gallery at www.wading-in.net |
#23
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Ghosting Problem
quote who= Al Denelsbeck /:
Good luck with it! Get it right and the pics should be excellent! Sorry for the late reply. Thanks so much for your reply. It really helps. The final race of the series is tonight (but they are calling for rain). I am going to give it a try again. I will meter the sky and then go from there.. Thanks again, J -- Justin F. Knotzke http://www.shampoo.ca |
#24
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quote who= Al Denelsbeck /:
Good luck with it! Get it right and the pics should be excellent! Sorry for the late reply. Thanks so much for your reply. It really helps. The final race of the series is tonight (but they are calling for rain). I am going to give it a try again. I will meter the sky and then go from there.. Thanks again, J -- Justin F. Knotzke http://www.shampoo.ca |
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