The Recent F/stop Controversy

Started 1 month ago | Discussions thread
mamallama
mamallama Forum Pro • Posts: 55,595
Re: Yep, that's the modern world, all right.

Great Bustard wrote:

mamallama wrote:

Great Bustard wrote:

mamallama wrote:

Great Bustard wrote:

mamallama wrote:

I love the clarity when just the mention of equivalence results in multiple threads that limit out at 150. A concise one sentence definition of equivalence might help the clarity.

If you can't say it all in a Twitter post, then it isn't worth saying -- that's the world we now live in. Maybe if I ask the POTUS, he can do it just for you.

Now I know why it isn't worth saying.

Well, you were the one asking for the Twitter post version to get some clarity. So the three bullet points I gave:

  • For a given exposure, more light is projected on a larger sensor.
  • For a given scene, DOF, and exposure time, the same amount of light is projected on all sensors, regardless of size.
  • Thus, the only way for a larger sensor to collect more light is to use a more shallow DOF or longer exposure time.

were too much of a chore for you -- you wanted a "concise one sentence definition of equivalence" in order to have "clarity", but now say that a one sentence definition isn't worth saying because it reflects the same mindset of someone whose politics you don't like. Oh well -- can't please them all, I suppose.

Sorry, that is not a one sentence definition.

No kidding -- I said that my three bullet points "were too much of a chore for you" because you wanted a single sentence. But when I noted that the POTUS is the king of single sentence explanations, you said, "Now I know why it isn't worth saying". But, if you must have a single sentence, here it is:

[Photographic] Equivalence is a paradigm that relates the visual properties of photos of a given scene from different formats based on perspective, framing, and the diameter of the [effective] aperture.

At least we know you are thinking of it as a paradigm.  The description of the paradigm is rather vague, however.

.

Go back and read what I asked for.

There's your single sentence and is no more or less helpful in understanding what Equivalence is about than, say, a single sentence definition of Capitalism:

an economic system characterized by private or corporate ownership of capital goods, by investments that are determined by private decision, and by prices, production, and the distribution of goods that are determined mainly by competition in a free market

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