22 hours ago
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Re: The Crux of the Matter
In reply to Jack Hogan,
6 months ago
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Jack Hogan wrote:
panos_m wrote:
I believe that is very simple. No matter what reflectance you put in front of it (10%, 60%, 75%, 100%) it will always read it the same that is it will always suggest the exposure that will produce the same "middle gray" raw value (the same distance in stops from saturation).
Agreed, sort of. A calibrated meter will always produce the same exposure
Hm = 10 / S lux-seconds
What else do you need to know to make an exposure decision and place the tonal range of the scene where you want?
What percent reflectance card would you need so that when spot metered it will give you 'proper' 'blind' exposure?
If "proper blind" exposure is that I obey the spot meter reading with the goal to reproduce the gray of the reflectance card then I need a card with the same reflectance the particular camera spot meter reads. That is different for my two cameras and obviously not 18%.
If I can deviate from the meter suggestion I can use a 18% card but I will have to add exposure in order to render it (the card) at 18%.
--
Panagiotis
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