A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
falconeyes Senior Member • Posts: 1,522
Re: I'm just glad I picked a system with a 2x crop factor...

slimandy wrote:

That would only make sense to people who use 35mm. I'd rather have the actual focal length and aperture.

That's the trap.

You can print everything onto a camera (and you always have to consider the camera as a whole).

I am not against printing F-stop, focal, image circle and iso onto a camera. Or the 35mm equivalent terms F-stop, focal and iso. Or just aperture diameter (in mm) and field of view (in degrees) which suffice to define the image artistically.

But I am absolutely against mixing up equivalent and non-equivalent units, as most people including the DPR staff always do. The most common mistake is to ignore iso when translating into equivalent units.

So, as a matter of fact and what this thread is about, an expression like "35mm f/2.8 is equivalent to 70mm f/2.8" is an utterly false statement, both technically and artistically. We really should stop people from using these false statements.

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