- #1
Belboz99
- 4
- 0
Hey all,
I went to my 10 year HS reunion party last night, and took about 125 photos using my Sony Alpha 350DSLR, a kit lens, and a Promaster hot-shoe flash. The camera was set to manual exposure of 1/10th sec to allow the ambient light to fill in the background, while the flash was left on TTL (auto) to act as the primary light for the subjects, thus keeping them sharp. Focal lengths varied from 18-80mm, but generally were wide-angle. ISO was cranked up to 400 ISO to get additional fill from the ambient light. The Lens was set to max aperture of 3.5-5.6.
The room itself wasn't very special, large chandelier type of lights which were diffused by even larger translucent coverings hung ~6 feet overhead, and they were for the most part the only source of light in the room. Even then, most of these photos were taken after those had been dimmed to the point where it became difficult to compose with the optical viewfinder from lack of light.When I got my images onto the PC that night, I processed all the images from RAW files using Capture One 4 by Phase One. It was then I started noticing something "unusual".Many of the photos exhibit some strange optical phenomena with the wine glasses. It's a rather unusually bright illumination of the wine that doesn't seem to fit the scene. There's just nowhere near that volume of light projected onto the glasses from any direction, save the flash unit itself, nor was there any gimmicky lighting within the glasses.
The glasses were fairly standard. It was a very nice restaurant, I wouldn't be too surprised if they were crystal. The wine was white, the red wine there exhibited no such effect. Also, there's a few photos where the same glasses were filled with ice water, again with no such affect.
The only other condition that seemed to have a role to play was how the glass was held. It seems that the wine is only illuminated if there is a hand directly behind it. IE, if the glass is held by the stem the wine does not glow. If the glass is held part-way down the area of the glass where the wine is, the part with a hand behind glows, the part above does not.I'm linking to a few of the photos, let me know what you think could be going on. Prominent effect:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20122.jpg
Water, no effect:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20106.jpg
There are 4 "illuminated" glasses in this image:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20087.jpg
Red vs White wine:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20066.jpg
This image exhibits a strong "partial illumination" effect, as the wine above where the man is holding the glass is completely transparent and un-illuminated.
http://dansphotos.org/var/albums/JHawks99/danophoto%20JHawks99%20037.jpg
If anyone is interested I'd be happy to provide larger images (14.5 megapixel) that will show full detail of the effect.
I've Googled for at least 1/2 hour, using both web and image searches and have come up completely dry.
Thanks,
Dan O.
http://danophoto.net
I went to my 10 year HS reunion party last night, and took about 125 photos using my Sony Alpha 350DSLR, a kit lens, and a Promaster hot-shoe flash. The camera was set to manual exposure of 1/10th sec to allow the ambient light to fill in the background, while the flash was left on TTL (auto) to act as the primary light for the subjects, thus keeping them sharp. Focal lengths varied from 18-80mm, but generally were wide-angle. ISO was cranked up to 400 ISO to get additional fill from the ambient light. The Lens was set to max aperture of 3.5-5.6.
The room itself wasn't very special, large chandelier type of lights which were diffused by even larger translucent coverings hung ~6 feet overhead, and they were for the most part the only source of light in the room. Even then, most of these photos were taken after those had been dimmed to the point where it became difficult to compose with the optical viewfinder from lack of light.When I got my images onto the PC that night, I processed all the images from RAW files using Capture One 4 by Phase One. It was then I started noticing something "unusual".Many of the photos exhibit some strange optical phenomena with the wine glasses. It's a rather unusually bright illumination of the wine that doesn't seem to fit the scene. There's just nowhere near that volume of light projected onto the glasses from any direction, save the flash unit itself, nor was there any gimmicky lighting within the glasses.
The glasses were fairly standard. It was a very nice restaurant, I wouldn't be too surprised if they were crystal. The wine was white, the red wine there exhibited no such effect. Also, there's a few photos where the same glasses were filled with ice water, again with no such affect.
The only other condition that seemed to have a role to play was how the glass was held. It seems that the wine is only illuminated if there is a hand directly behind it. IE, if the glass is held by the stem the wine does not glow. If the glass is held part-way down the area of the glass where the wine is, the part with a hand behind glows, the part above does not.I'm linking to a few of the photos, let me know what you think could be going on. Prominent effect:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20122.jpg
Water, no effect:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20106.jpg
There are 4 "illuminated" glasses in this image:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20087.jpg
Red vs White wine:
http://dansphotos.org/index.php/JHawks99/danophoto%20JHawks99%20066.jpg
This image exhibits a strong "partial illumination" effect, as the wine above where the man is holding the glass is completely transparent and un-illuminated.
http://dansphotos.org/var/albums/JHawks99/danophoto%20JHawks99%20037.jpg
If anyone is interested I'd be happy to provide larger images (14.5 megapixel) that will show full detail of the effect.
I've Googled for at least 1/2 hour, using both web and image searches and have come up completely dry.
Thanks,
Dan O.
http://danophoto.net
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