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Equivalence goes completely out the window once you start moving. Don’t MoveĪll of equivalence – all of it – assumes that you don’t move your physical position. Instead, you’re left with only three variables still standing: focal length, aperture, and ISO.

But when you get down to the essence of equivalence, that’s all superfluous. (They aren’t hard, and I’ll cover them below.) Sure, a thousand little differences mean that your photos will never look identical even after you get the math right. If you want to take equivalent photos with a Nikon DX crop-sensor camera and a Nikon FX full-frame camera, you’ll need to do a few calculations.

Print Size, Total Light, Airy Disks, Circles of Confusion, and Eigenvaluesīefore we start, what is equivalence? Quite simply, it’s the way you can take similar looking photos with two different cameras – two cameras of differing sensor sizes, to be more specific.

Sometimes, Equivalence Isn’t Possible with Your Gear.

Why Focal Length Is Clearly Part of Equivalence.

It directly matters any time you try to recreate the look of a particular image (such as an inspiring portrait photo you saw online), or when you’re deciding among camera systems in the first place. There are useful things to be gained from equivalence. Quite simply, now that we’ve entered a bit of a cool-down period on the equivalence debate, it’s become a good time to turn back and examine it with rational heads. That’s my true reason for writing this article: to emphasize the three important takeaways of equivalence.

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The article below is limited in scope simply to focal length, aperture, and ISO – the three key takeaways from the equivalence discussion that I think everyone should know.

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It goes into things like print size, pixel density, diffraction, and the ugly duckling of “total light.” Feel free to read it if you’re interested in those topics. Note: On Photography Life, we already have a very detailed article on equivalence here.

Let’s stop this madness before it’s too late. However, as we near the two-year anniversary of the ceasefire, it seems that isolationist thoughts – i.e., that equivalence is isolated just to focal length – are resurfacing again. Nasim’s famous quote, “Everyone is right, everyone is wrong,” has been etched both into the peace treaty and into the hearts of millions. After the 2012-2017 Great Equivalence War, photographers everywhere agreed never to utter that word again.