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Author Topic: Filter for direct sun photography  (Read 12842 times)

PeterJ

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Re: Filter for direct sun photography
« Reply #30 on: November 27, 2011, 02:37:35 AM »
One interesting thing as a side-note is that after the filter first arrived I took a a snap as above, minus the eclipse and the histogram wasn't like anything I'd seen before:



I was expecting the peaks to be evenly spaced, I wondered if the filter and/or lens was doing anything funky but it does much up well with the Wikipedia "color vision" article that has a diagram showing human eye response:



Still the peaks seem to drop off more rapidly, I guess just a sensor limitation where the silicon / bayer filter response doesn't match the eye exactly? It looks pretty predictable so I thought that might have been the sort of thing that would be corrected, although that was a RAW import into lightroom so maybe it does happen during the display and/or export stages?
« Last Edit: November 27, 2011, 02:45:49 AM by PeterJ »

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Re: Filter for direct sun photography
« Reply #30 on: November 27, 2011, 02:37:35 AM »

nubu

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Re: Filter for direct sun photography
« Reply #31 on: November 27, 2011, 04:23:02 AM »
Never unfiltered Live-View with sun in the field of view, especially when on tripod!!! Normal exposures (no tele..) are no problem. Its the longer exposure time (the shutter does not close with live view) that kills the pixels...
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Re: Filter for direct sun photography
« Reply #32 on: November 27, 2011, 02:23:35 PM »
One interesting thing as a side-note is that after the filter first arrived I took a a snap as above, minus the eclipse and the histogram wasn't like anything I'd seen before:



I was expecting the peaks to be evenly spaced, I wondered if the filter and/or lens was doing anything funky but it does much up well with the Wikipedia "color vision" article that has a diagram showing human eye response:



Still the peaks seem to drop off more rapidly, I guess just a sensor limitation where the silicon / bayer filter response doesn't match the eye exactly? It looks pretty predictable so I thought that might have been the sort of thing that would be corrected, although that was a RAW import into lightroom so maybe it does happen during the display and/or export stages?


I don't think you're comparing like with like. The x-axis on your photo histogram is NOT frequency/wavelength. But it is on the spectrum from wikipedia. There is no reason why the graphs should match. As I understand it, the histogram's x-axis is "pixel intensity (black at the far left, and saturated/maximum at the right)", and the y-axis is "number of pixels at this intensity".

But if I have misunderstood what you were saying, forgive me.
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Re: Filter for direct sun photography
« Reply #32 on: November 27, 2011, 02:23:35 PM »