But a variable aperture lens would offer more control in more circumstances. iPhone 17 or iPhone 18 A report from The Information back in the summer suggested that the new feature would be ...

F-stop is a consistent way to measure lens aperture, and helps photographers control exposure and depth of field. It is noted with an f followed by a slash and number, for example f/2.8.

Yes, that’s it : a 50 mm lens with a F:2 aprture will have a diaphragm hole of exactly 25 mm as 50:2 is 25, a 100 mm at the same aperture will have a diaphragm hole of 50 mm, and a 600:4 will ...