What is equivalence good for?

Started Jul 25, 2014 | Discussions thread
mostlyboringphotog Senior Member • Posts: 8,187
Re: What is equivalence good for?

mostlyboringphotog wrote:

Just another Canon shooter wrote:

olliess wrote:

Just another Canon shooter wrote:

...the answer is as simple as that: just multiply three numbers (F-stop, FL and ISO) by the crop factor.

I think multiplying the ISO by the crop factor would actually be equivalent to a "screwup," but I don't want to derail this fascinating and original conversation. So please carry on.

It would be a screwup if you don't.

GB does not want to include it because he does not want to be criticized on the basis that different sensors have different noise characteristics. Recent sensors have remarkably close QE, so this is not a more important problem than, saying that different lenses with the same f-stop differ by their t-stops.

Pretty soon, all the sensors will be about the same regardless of the size and even the iphone will exceed your IQ need, then we will go back to what photo looks better rather than equivalent, IMHO.

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