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05-06-2013, 07:37 AM   #16

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Yeah. Pentax cameras always underexpose a bit.

05-07-2013, 01:56 AM   #17
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QuoteOriginally posted by MD Optofonik Quote
I thought it was a 1/2 stop. Nevertheless, I know that debate rages on. To make matters more complicated my meter , as stated in the manual, is calibrated for 18% grey but the spot metering is calibrated to "midtone". What is the value of this midtone? Who knows? The manual doesn't say.
Midtone is i assume middle grey and that is 18% grey.
But these values are only used for printing since it's 50% white and 50% black hence it's middle grey.

Light meter normally follow ANSI PH3.49-1971 (the ISO is the same code i believe).
It state that C as 30 +/- 5 at 100 ISO
It's indeed 1/2 stop out and not 2/3th, my mistake.

Here you can find the formula's under Relationship of EV to lighting conditions
Exposure value - Wikipedia, the free encyclopedia
05-07-2013, 01:59 AM   #18
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QuoteOriginally posted by IchabodCrane Quote
Sorry if this is off-topic but this looks like a good place and time to ask this question: Does Pentax matrix metering favor correct exposure of high brightness parts of the image at the risk of overall underexposure? I ask as it seems exposure is usually a little lower in matrix metering vs center-weighted.
Since it's about 2 very different modes, one is smart while the other is stupid.
Lets say Pentax Matrix mode is pretty conservatie with it's highlights, which is good with digital though.

Spot and center wieght should take a more average aproach.

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