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#1
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Techniques for avoiding reflections please
I'm trying to take some photos of some posters (typically 4ft x 3ft or
thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. This occurs whether I try using the natural light or the Tungsten lights in the room. I've tried a polarizing filter but not to good effect. One problem is that if I use the natural light the image is too dark for me to see whether there is a reflection in the viewfinder. I am not in a position to bring the posters down and put them in a good location. What techniques can I try to get good images? Many thanks. -- AnthonyL |
#2
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Techniques for avoiding reflections please
AnthonyL wrote:
I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. This occurs whether I try using the natural light or the Tungsten lights in the room. I've tried a polarizing filter but not to good effect. One problem is that if I use the natural light the image is too dark for me to see whether there is a reflection in the viewfinder. I am not in a position to bring the posters down and put them in a good location. What techniques can I try to get good images? Maybe if you bracketed a few shots and put them together as an HDR? |
#4
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Techniques for avoiding reflections please
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#5
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Techniques for avoiding reflections please
AnthonyL wrote:
I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. This occurs whether I try using the natural light or the Tungsten lights in the room. I've tried a polarizing filter but not to good effect. One problem is that if I use the natural light the image is too dark for me to see whether there is a reflection in the viewfinder. I am not in a position to bring the posters down and put them in a good location. What techniques can I try to get good images? One thing to try is shooting off axis then straightening it out in photoshop. You will lose some resolution of course. -- Paul Furman www.edgehill.net www.baynatives.com all google groups messages filtered due to spam |
#6
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Techniques for avoiding reflections please
Paul Furman wrote:
AnthonyL wrote: I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. Being posters I assume they are actually flat. This being the case, turn on the tungsetn lamps and take a whole bunch of pictures from somewhat different places, so you get good reflectionless images of each part of the poster. Be sure to use manual settings on the camera so the exposures are the same. Save as raw. Process the results identically. Ideally save as 16 bit Tiffs. Then go into Photoshop and crop out all the reflections. You may end up with more than one file per exposure. Then put them all back together with a first rate panorama program like Hugin. Doug McDonald |
#7
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Techniques for avoiding reflections please
I'm trying to take some photos of some posters (typically 4ft x 3ft or
thereabouts). Some are mounted in glass frames. Use two flashes at 45 angle to the poster on each side, use fastest sync speed and a small aperture to reduce reflections from ambient light to negligible brightness. Some lense become unsharp at smallest aperture so this is a compromise. If you have only one flash take one photo with the flash on each side then blend them together; use manual exposure and manual white balance so the two photos will match exactly. Hopefully there are no dust or scratches on the glass. Use google to check out "copystands". Same principle. |
#8
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Techniques for avoiding reflections please
Mmm, you are a bit screwed really. I would try to talk to someone in charge
and try to come up with a deal with them so that they can be removed to photograph them. "AnthonyL" wrote in message ... I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. This occurs whether I try using the natural light or the Tungsten lights in the room. I've tried a polarizing filter but not to good effect. One problem is that if I use the natural light the image is too dark for me to see whether there is a reflection in the viewfinder. I am not in a position to bring the posters down and put them in a good location. What techniques can I try to get good images? Many thanks. -- AnthonyL |
#9
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Techniques for avoiding reflections please
Ali wrote: Mmm, you are a bit screwed really. I would try to talk to someone in charge and try to come up with a deal with them so that they can be removed to photograph them. "AnthonyL" wrote in message ... I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. The room is quite dark with two small windows in adjacent sides and also has Tungsten uplights. I have no problem with the unmounted posters as I can shoot in RAW and then process with Tungsten white balance. But I get unwanted reflections with the ones mounted behind glass. This occurs whether I try using the natural light or the Tungsten lights in the room. I've tried a polarizing filter but not to good effect. One problem is that if I use the natural light the image is too dark for me to see whether there is a reflection in the viewfinder. I am not in a position to bring the posters down and put them in a good location. What techniques can I try to get good images? If you can bring lighting into the room, powerful enough shielded lamps or flash guns may overwhelm the reflections, although quality of the poster image could suffer. -- Frank ess |
#10
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Techniques for avoiding reflections please
On 5/8/08 12:48 PM, in article q1HUj.27150$zw.11290@trnddc04, "peter" wrote: I'm trying to take some photos of some posters (typically 4ft x 3ft or thereabouts). Some are mounted in glass frames. Use two flashes at 45 angle to the poster on each side, use fastest sync speed and a small aperture to reduce reflections from ambient light to negligible brightness. Some lense become unsharp at smallest aperture so this is a compromise. If you have only one flash take one photo with the flash on each side then blend them together; use manual exposure and manual white balance so the two photos will match exactly. Hopefully there are no dust or scratches on the glass. Use google to check out "copystands". Same principle. 30° would be better. |
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