The fallacy of 35mm "equivalent focal lengths"

Started 2 months ago | Discussions thread
Mark Scott Abeln
Mark Scott Abeln Forum Pro • Posts: 13,331
Re: Equivalence does...

Great Bustard wrote:

...take them all into account:

But why these six properties and not others, such as noise, detail, dynamic range, color, bokeh, distortion, etc., etc., etc.? The reason is that these six properties are independent of the technology. However, with proper assumptions about the technology, these other attributes can be added in to the equation, and this essay goes into great depth on those points (with special attention being paid to noise, detail, and dynamic range).

Yes, they can be added to the equation, as the OP is attempting to do (in an awkward way).  I've seen someone try to reformulate equivalence by using the thick lens equation, for example.

As with all things, the more specific one wants to be, the more factors that need to be accounted for.

And that requires special information which may be hard to come by. On the other hand, sensor size, focal length, aperture, shutter speed, and ISO are readily and nearly universally available.

 Mark Scott Abeln's gear list:Mark Scott Abeln's gear list
Nikon D200 Nikon D7000 Nikon D750 Nikon AF-S DX Nikkor 35mm F1.8G Nikon AF Nikkor 50mm f/1.8D +2 more
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