Originally posted by sany So, the classic photographers did without any aide like split screen? ain't they? if they can why can't we learn to do that?
We certainly CAN learn. And some of those classic toggers couldn't even see what they were shooting! Not through a lens, anyway. I still have cameras with what is called a "sportsfinder", which is basically a wire frame that hangs off the camera. You try to frame a shot, and hope! That's how many "press cameras" of long ago worked.
Those, or any non-reflex camera without a rangefinder or screen for focusing -- how to focus? You must measure, or guess-estimate the distance, or pace it off. That's how I learned to use simple folding cameras. The subject looks to be 5m away, so set the focus to 5m. Set the aperture so that you have enough depth-of-field to capture what you want. I must work like that sometimes even with my dSLR if the light is too bright or too dim to see a subject clearly. I set the lens so it's sharp from 3m to 4m, then only shoot subjects that I think are within that range.
Or I use an old trick: Pace off the distance to some marker, a door or chair or plant or whatever. Set the lens focus to that distance. Wait until something or someone interesting reaches that point, then shoot. This is called pre-focusing.
Practice practice practice. Practice at different apertures. I practiced with my old folder for a while until it all became automatic for me -- not just distance, but guessing the light too. It's so easy with a dSLR in good light -- aim at something with strong contrast and slowly focus until the separation becomes sharp. Ah, that's the magic word: SLOWLY! Don't hurry. Take your time.