John Sheehy
Veteran Member
You might giggle, but the fact is, "crop camera" actually originally meant a camera with a smaller sensor area than the line of lenses that it is intended for can use. That is not silly, if you don't heap myths on top of "crop".I get that 35mm film was around for so long that it became the standard size, but if you really look at a FF sensor it is quite small physically. I mean, how many FF sensors would actually fit on a standard sheet of paper?
This is why I giggle when someone refers to anything smaller than FF to be a Crop.
And so, "crop factor" became a thing, and it was then extended to sensors that do not use lenses deigned for a larger sensing area by default, like 1" sensors, which have their own lens series or built-in lenses.
Nothing wrong with this "crop math", as long as you do all of it when thinking of equivalence; many users of small-sensor cameras like to kid themselves that the actual open f-ratio is still the "equivalent f-ratio", when in fact, it is not.
