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09-14-2021, 10:02 PM   #76
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QuoteOriginally posted by GUB Quote
Yes -conversely you can think of metering via the histogram as the digital equivalent of the Zone System.
Pity that with Pentax the live view histogram as well as that for playback are based on output from the JPEG engine and don't represent metering per se. For example, with the custom mode set to monochrome, the playback will show identical histograms for white, red, green, and blue, despite the capture data being anything but that.


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09-15-2021, 01:14 AM - 3 Likes   #77
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In real world use (which is the only use that counts) Sunny 16 has got a lot in common with the zone system. For example, in this one from last year the directly sunlit areas of grass fell within my usual "Sunny 16" of f/11 at 1/125 at ISO 100, but using that exposure would have drastically underexposed the shaded areas. I knew that with the GX-10 (K10D) that I was using I could overexpose the sunlit areas by two stops and still have usable detail in the raw file -- in other words put them in Zone VII -- so that's what I did by exposing at f/8 at 1/60 at ISO 100. It still left the shaded areas underexposed but within the range that I could recover in Camera Raw, and it meant that there would be some unimportant small patches blown to white, but it was the best compromise to get a workable raw file.

So in terms of practical application, using Sunny 16 is very similar to using the zone system, but doing it by eye rather than with a spot meter.

09-15-2021, 03:51 AM   #78
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QuoteOriginally posted by stevebrot Quote
Pity that with Pentax the live view histogram as well as that for playback are based on output from the JPEG engine and don't represent metering per se.
Yes I know that is commonly stated but why do I rarely get any unpleasant surprises when I open my images in Darktable.
Note - I consistently have the jpeg settings at reset with the dynamic range settings turned off.
09-15-2021, 05:19 AM - 2 Likes   #79
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Even with the limitations of the JPEG engine, the histogram's still useful. If you expose to either end of the range, you know there's some room either side for recovery - so it's a safe / pessimistic representation, which isn't such a bad thing overall...

09-15-2021, 12:48 PM   #80
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QuoteOriginally posted by GUB Quote
Yes I know that is commonly stated
Not only is it commonly stated, but it is quite true. Usually it should not be a huge problem, despite a contrast bump with the default "Bright" setting, unless something like lens correction for vignette is done or a digital filter active or accidental use of "Muted", "Cross-processed", or "Radiant" custom settings (all three are fairly common in troubleshooting requests).
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