Proper Blind Exposure with a Gray Card

Started Nov 12, 2012 | Discussions thread
Jack Hogan
Senior MemberPosts: 3,825Gear list
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Re: The Crux of the Matter
In reply to panos_m, Nov 12, 2012

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?

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