I've tried many-a-times to understand infinity as related to photography but always ended up feeling more confused than before. Time and again I pushed it to the back of mind.
I've googled it several times and found all the information confusing.
Here's is what I think I know so for:
- Infinity is a focal point in the image beyond which everything is in focus, regardless of aperture size.
- This point can also be quantified as 100 * focal length.
- If infinity is indeed measured as 100*FL, what is the associated unit of measurement? mm, metres?
- Semantically infinity should mean something that can't measured, so why call this focal point that can be measured (1000 * FL) infinity? It is counter-intuitive.
- If everything beyond infinity is in focus, this must not apply to wide apertures where everything in the background, and thus presumably beyond infinity, is out of focus or blurred. Right? Wrong?