"Crop-ability" of images?

Started 3 months ago | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 69,811
Re: Exposure vs Exposure
4

john isaacs wrote:

Iliah Borg wrote:

john isaacs wrote:

"f/2.8 is f/2.8" is true.

"50/2.8 is 200/2.8" isn't always true.

It is never true. What is true is 50/17.86 is 200/71.44.

But you actually knew that, right?

The statement was 'f/2.8 = f/2.8'. If you're talking about the f-number always being the same, then the statement would have been '2.8=2.8' and is of course always true. However, the value of 'f/2.8' depends on what is the value of 'f', and in the example that Iliah gave, the 'f' was different.

It's why it's a silly statement. '2.8=2.8' is a tautology, as is 'f/2.8=f/2.8' if the value of 'f' is the same. However, the people that recite the little mantra do so in situations when the 'f' on the left hand side is different from the 'f' on the right hand side. Using the same signifier for two different things is almost guaranteed to cause confusion, but we've been there before, haven't we?

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