It depends on your eyes. My delaminating eyeballs need all the help I can get when shooting my old MF lenses.
I replaced the stock screen on my K20D with a katzeye-clone and it helps in the right conditions, with contrasty well-lit subjects. But it's not enough. So I depend on focus confirmation and catch-in-focus. I think of the order of usefulness as: 1) the screen gets me in the neighborhood; 2) focus confirmation puts me almost there; 3) CIF nails it.
In other circumstances I depend on zone-focus. (If the zone extends to infinity, it's hyperfocus.) This is especially vital if I'm in bright glare-y light and can barely see what's in the viewfinder. Set the zone, judge distances, wave the camera in the right direction, and shoot.
How much would a focus screen help you? Probably not as much as you hope.
Last edited by RioRico; 03-27-2012 at 01:30 PM.
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