"Equivalence" demonstrated: Canon 5D and Panasonic GX1

Started Apr 27, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 40,751
The "conversation" and "failure to communicate"

boggis the cat wrote:

Ulric wrote:

boggis the cat wrote:

Great Bustard wrote:

Thus, I see no reason not to use the word "equivalent" to describe photos that have the same perspective, framing, DOF, shutter speed, and display size even when other elements of IQ are not necessarily the same.

'Equivalent' does not have the narrow meaning that you may prefer it to have.

I had this very conversation only yesterday.
GB: "Addition goes like this: you add two numbers and the result is 5."
U: "What? It depends on the numbers, the result can be anything."
GB: "The numbers are 2 and 3. It says so on my blog."
U: "What if the numbers are 2 and 4?"
GB: "Why am I constantly being misrepresented? The result is 5 because the numbers are 2 and 3!"
U: "Have you considered making up a name for the process of adding these particular numbers, to distinguish from addition in general?"
GB: [googles addition and cuts and pastes definition from online dictionary] "Is there something else you want me to explain?"
U: [goes to bed]

Actually, the "conversation" went like this:


which, of course, is quite different than what you say (ask me if I'm surprised).

Yes, there does seem to be a disconnect somewhere.  But not like a cultural gap or misunderstanding -- more like trying to communicate with an alien species.

I concur:


For the record, you are saying that a photo of a scene taken at 25mm f/2.8 1/100 ISO 400 on an Olympus E1 is *not* equivalent to a photo of the same scene also taken at 25mm f/2.8 1/100 ISO 400 on an EM5.



Well, first you say that 25mm f/2.8 1/100 ISO 400 on an E1 is not "equivalent to" 25mm f/2.8 1/100 ISO 400 on an EM5, then you say that 50mm f/2 on 4/3 is "equivalent to" 100mm f/2 on FF, so I'm thinking that if anyone is causing "unnecessary confusion"...

Nicely sums up the whole matter for me.

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