Uuglypher wrote:
"EXPOSURE TRIANGLE"??? Really ?
Just for sake of argument...( I bein' me, 'n' all...)...
"Exposure" refers to what happens when - or what specifically has to be accomplished in order to allow a single bunch of light of a particular duration and intensity to impinge upon a photosensitive emulsion or digital photosensor.
That's it. ....That's all she wrote!
That's "EXPOSURE"
"Exposure" involves two...and only two variables.
"Photographic Exposure" thus is regulated by only two functional controls;
Shutter duration / "shutter speed" (the adjustable period during which light is allowed to pass to the emulsion or sensor) and lens aperture ( the adjustable roughly circular area of the hole through which the light must pass on its way to exposing the emulsion or sensor)
That's it!
Two controls: shutter and aperture.
So what's all the whoop-de-doo with this "Exposure Triangle" stuff?
Oh...you mean, by asking that question, that you are actually concerned with negative or image "brightness"(??) that results from what you have done with your camera and lens before squeezing the shutter...not just "exposure"??
All rightee then.....
if so, then you can think in terms of an Image Brightness "Triangle"
or
"Image Brightness "Square"
or
"Image Brightness "Pentagon"
"What the Hell are You Talkin' About?" I hear some cry.
Well, hear me out.
"Exposure" by definition, is controlled solely by shutter duration and aperture. (unarguable fact,unless, of course you wish to redefine the word "exposure")
Given a chosen exposure, image brightness is also influenced by:
Use of Filters of differing transmission indices (polarizing, color -altering, neutral density)
Exposure Compensation settings, and
photosensitivity of emulsion("film speed"/ ASA) or sensor (ISO)
Of course, if we use a filter of given transmission we can accomodate to desired image brightness by adjusting shutter, aperture, ISO, and/or Exposure compensation. hmmmm....five interdependant variables..must be a pentagon, eh?
So...we have an Exposure "Se-Saw/ balance beam/ teeter-totter, ( aperture and shutter speed)
or an image brightness triangle, square or pentagon depending upon how many and which contolable variables we wish to control.
If we think in terms of image brightness, we have to consider more controllable variables than just the two involved in "exposure".
Why do I even dare to mention this? Because i've found that beginning photographers are perfectly capable of thinking in terms of image brightness, rather than having to accept an initial simpistic and somewhat erroneously expanded concept of "Exposure" as if a triangle were the begin-all and end-all of success in photographic achievement of optimal image brightness.
Some will find it hard to believe that it's all vastly less complicated in this digital era than 'twas "back in the day" when solution temperatures, developer formulae, agitation times, contrast filter transmission variations, color filter transmission variation, point-source versus diffusion enlarger illumination, etc., etc... also figured into the gemisch!
Yesiree, Bob! Ol' Ansel's previsualization process is far simpler today than heretofore!
I'm confident this will meet with unanimous agreement!
Dave in SD
Comments? Questions? Slings? Arrows?
"EXPOSURE TRIANGLE"??? Really ? br br... (
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The duration and intensity of light have no photographic meaning without taking into consideration the sensitivity of the sensor or film (ISO). Thus, the Exposure Triangle.
Edit: I also would not call you an idiot, but this is not exactly one of your most brilliant posts!