Originally posted by jsherman999 And assuming you were shooting from the same position and using a FL that gave you the same FOV, your K-r, m4/3 and D810 would all have different DOF, noise, and DR.
Same exposure, but different total light = different images.
Equivalence describes precisely why we would even want Pentax FF, because it describes precisely why the format is even different in the first place.
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As I remember, this thread started under the statement that "aps-c costs more than one stop relative to full frame"
So, why now you are supporting this argument based on something totally different. "one stop" refers to EXPOSURE, and based on it, the OP based his arguments on EXPOSURE. Now things have changed. Your answer is: " Same exposure but totally different light = different images"....
C'mon, lets be honest here. The moment you change lenses, or change subject to camera distance, of course we will get a different image, EVEN THOUGH WE ARE NOT CHANGING SENSOR FORMAT (FILM). And even under this horrendous scenario, if the light falling on subject and shutter speed remains the same, we will need THE SAME F***ING F/STOP to achieve THE SAME EXPOSURE, no matter which lens or camera format we choose!
Again, c'mon guys, embrace and accept the new technology on its own turf. Learn the new reference standards and try to keep up with its advances in time. Stop torturing yourselves trying to "translate" the new specs into what they meant with the old stuff, because you"ll find that some terms have no translation.
Photography is like a whole language. You learn the basic words, the sentences. In some time you simply start talking, then writing and reading in this special language. You even learn the slang (tricks of the trade). As any language, it has its variations (film formats).
But one day comes a new language, that tossed a lot of word that we already know an introduces new ones for which we never had a meaning or synonym... We try to learn this new language, but some will succeed and some will fail learning it.
The ones that succeed were the ones that reached the "second nature" state. That is when you simply think, understand and speak the new language without even caring for its meaning or translation to the old one. The ones that failed, were the ones that kept thinking in the old language and struggled to translate every single word to the new language...