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#1
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Long exposures are noisy
The pictures themselves are great - but the camera (Pentax K100D) makes
an absolute racket. There's a bit of noise during the exposure itself, but afterwards, while I presume the camera is processing it, it sings and coughs to itself at length. Is this normal? Also, it seems to take the camera as long to process a 30-second exposure as it does to take the picture itself (i.e. before the camera is ready for further action). Why should this be the case? Daniele |
#2
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Long exposures are noisy
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#3
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Long exposures are noisy
Also, it seems to take the camera as long to process a 30-second
exposure as it does to take the picture itself (i.e. before the camera is ready for further action). Why should this be the case? This is the noise reduction feature (image noise, not audible noise) that kicks in for long exposures. You can turn it off if you like, either via the setup or custom menu. --------------- Marc Sabatella Music, art, & educational materials Featuring "A Jazz Improvisation Primer" http://www.outsideshore.com/ |
#4
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Long exposures are noisy
According to D.M. Procida :
The pictures themselves are great - but the camera (Pentax K100D) makes an absolute racket. There's a bit of noise during the exposure itself, but afterwards, while I presume the camera is processing it, it sings and coughs to itself at length. Is this normal? Also, it seems to take the camera as long to process a 30-second exposure as it does to take the picture itself (i.e. before the camera is ready for further action). Why should this be the case? Well ... based on the Nikon D70, the default mode for long exposures is "Long exp. NR" mode, which takes a second "non" picture with the same exposure time as the actual exposure, but with the shutter closed. This gives the camera a reference for the noise patterns for that length of exposure at the temperature at which the camera is being used. This is then subtracted digitally from the actual image, making for a much better image than if you turn the NR mode off (which I do when shooting fireworks, since I am more willing to live with the noise than to lose the ability to take another shot right away. Your camera may also offer a way to turn off the NR mode (whatever they call it), and you should experiment with shooting two long-exposure shots (one with and one without) just to show you what the difference in appearance is, so you can know when you can live with the noise as a tradeoff for the ability to shoot another exposure soon after the first. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#5
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Long exposures are noisy
On Aug 2, 1:56 am, "Marc Sabatella" wrote:
This is the noise reduction feature (image noise, not audible noise) that kicks in for long exposures. You can turn it off if you like, either via the setup or custom menu. It's more hot pixel reduction than noise reduction... Ray |
#6
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Long exposures are noisy
"DoN. Nichols" wrote in message ... According to D.M. Procida : The pictures themselves are great - but the camera (Pentax K100D) makes an absolute racket. There's a bit of noise during the exposure itself, but afterwards, while I presume the camera is processing it, it sings and coughs to itself at length. Is this normal? Also, it seems to take the camera as long to process a 30-second exposure as it does to take the picture itself (i.e. before the camera is ready for further action). Why should this be the case? Well ... based on the Nikon D70, the default mode for long exposures is "Long exp. NR" mode, which takes a second "non" picture with the same exposure time as the actual exposure, but with the shutter closed. This gives the camera a reference for the noise patterns for that length of exposure at the temperature at which the camera is being used. This is then subtracted digitally from the actual image, making for a much better image than if you turn the NR mode off (which I do when shooting fireworks, since I am more willing to live with the noise than to lose the ability to take another shot right away. Your camera may also offer a way to turn off the NR mode (whatever they call it), and you should experiment with shooting two long-exposure shots (one with and one without) just to show you what the difference in appearance is, so you can know when you can live with the noise as a tradeoff for the ability to shoot another exposure soon after the first. And is called dark frame subtraction. |
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