Exposure control in a raw developer: misnomer?

Started Jan 30, 2013 | Discussions thread
Joofa Senior Member • Posts: 2,104
Re: Density of light

Great Bustard wrote:

http://www.merriam-webster.com/dictionary/density

2: the quantity per unit volume, unit area, or unit length

http://en.wikipedia.org/wiki/Light

In common with all types of EMR, visible light is emitted and absorbed in tiny "packets" called photons

Combining the two, we have exposure:

http://www.josephjamesphotography.com/equivalence/index.htm#exposure

The exposure is the density of light (total light per area -- photons / mm²)

...

Seems like there's plenty of "proper qualification" going on, and seems even more clear that the proponents of such terms fully understand what they are trying to say.



Under ordinary setups we don't see photons. We only have access to some measure of photoelectrons at best. With the usual digital cameras around there is no reliable way of relating it back to the variation in photon flux, and hence, effectively the so-called "density of light", unless you want to take an image of a uniform brick wall.

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