KaaX wrote: jotdeh wrote:
You\'re not dragging the green channel down to the same \"bad\" as the red - you allow the red more time to compensate for its weakness. What you lose in quality is that your shutter time slow down 1.5 stops. That may or may not matter, and it may or may not give a significant enough colour quality improvement. It depends. But I\'m intrigued to try this, especially for flower shots.
douglasf13 wrote:
The magenta filter allows you to bring up the exposure in the R and B channels by attenuating the G channels, which will potentially result in less shadow noise and an expansion of usable DR.
I see. So compared to the \"normal\" case you overexpose and use the magenta filter to keep the green sensels from blowing out. Hmm...
I\'m still not sure I\'m buying the \"less shadow noise\" argument. If you\'re shooting at base ISO, the shadow noise (at least on contemporary Sony/Nikon sensors) is not an issue at all. And if you\'re not shooting at base ISO, then you pay for balanced R-G-B exposure by having to increase your ISO by 1.5 stops which, I think, would kill all and any shadow noise advantage.
Basically, if you have more than enough light, you\'re solving a problem which isn\'t a problem. And if you don\'t have enough light, you\'re paying by increased ISO which makes the exercise pointless.
I\'ve really only heard of magenta filters and uniWB used by landscape shooters with tripods at base ISO. I agree that the newer sensors have made this method less useful, but you\'ll still get cleaner shadows, which could make a difference to some who benefit from wringing out the most DR that they can. I\'ve personally never had a use for it, and I don\'t think the technique would make sensor for everyday, non-tripod shooting.
KaaX wrote: jotdeh wrote:
You\'re not dragging the green channel down to the same \"bad\" as the red - you allow the red more time to compensate for its weakness. What you lose in quality is that your shutter time slow down 1.5 stops. That may or may not matter, and it may or may not give a significant enough colour quality improvement. It depends. But I\'m intrigued to try this, especially for flower shots.
douglasf13 wrote:
The magenta filter allows you to bring up the exposure in the R and B channels by attenuating the G channels, which will potentially result in less shadow noise and an expansion of usable DR.
I see. So compared to the \"normal\" case you overexpose and use the magenta filter to keep the green sensels from blowing out. Hmm...
I\'m still not sure I\'m buying the \"less shadow noise\" argument. If you\'re shooting at base ISO, the shadow noise (at least on contemporary Sony/Nikon sensors) is not an issue at all. And if you\'re not shooting at base ISO, then you pay for balanced R-G-B exposure by having to increase your ISO by 1.5 stops which, I think, would kill all and any shadow noise advantage.
Basically, if you have more than enough light, you\'re solving a problem which isn\'t a problem. And if you don\'t have enough light, you\'re paying by increased ISO which makes the exercise pointless.
I\'ve really only heard of magenta filters and uniWB used by landscape shooters with tripods at base ISO. I agree that the newer sensors have made this method less useful, but you\'ll still get cleaner shadows, which could make a difference to some who benefit from wringing out the most DR that they can. I\'ve personally never had a use for it, I don\'t think the technique would make sensor for everyday, non-tripod shooting.
May 22, 2012 at 02:21 PM
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