Posted 30 March 2010 - 12:31 PM
What does it mean when you have, say a f/2.8-5.6 split? I came across it in another forum and I'd never heard of it.
Posted 30 March 2010 - 12:42 PM
Posted 30 March 2010 - 12:45 PM
Any times I've heard the term used it's setting the aperture half way between two f stop markings on the iris ring. E.G. split between f2.8 & f4, you set the aperture at the mid point between these stops.
Posted 30 March 2010 - 01:30 PM
Posted 30 March 2010 - 01:41 PM
I don't think I've ever heard of a 2.8/5.6 split, but for the record that'd be an F4 Generally it has to do with increments between 2 stops which are next to each other.
Sorry yeah I just made up two F numbers because I was was just trying to find out what the split meant. How do you calculate that to be an F4? So it refers to increments between stops?
Edited by Aaron Solomon, 30 March 2010 - 01:42 PM.
Posted 30 March 2010 - 01:46 PM
The other time you might use a split is when you have 2 different luminance which you want to keep exposure on; let's say you meter a scene and you see that person A by the window is at an 8 and person b in the room is at a 2. You could bring in more light, but for this example you'll just call out a 8/2 split and split the difference in exposure. letting person A over expose a bit and person B under expose a bit. Again, this would be an F4 as its directly between 2 and 8 on the F stop scale (2/2.8/*4*/5.6/8).
Hope that helps.
Posted 30 March 2010 - 01:51 PM
Posted 30 March 2010 - 03:43 PM
Posted 30 March 2010 - 04:10 PM
The thing with F stops that helped my was looking at their pattern of doubling and halving every other number so:
0.5 0.7 1 (see double the .5) then 1.4 (double the .7) 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45 64 . . .
For the most part you'll be working with 1.4--->22 on lenses