05-29-2012, 03:26 AM
If you check a dof calculator like this:
http://www.dofmaster.com/dofjs.html
With a circle of confusion of 0,004 mm (just below the D800 pixel size), a 28 mm at f8, focused at 100 m (counting as infinite, I'd say wide angles usually mark in the focusing ring 3 m as far distance before infinity), renders a focused field from 19,7m to infinity. In a 20 mm would be from 11,1 m to infinity.
Theoretically, you couldn't improve focus beyond 19,7 m because already is in focus in a camera with that resolution. So, in a wide landscape with a wide angle, there's not much critical focus here (in my opinion).
Anyway, I guess that post from Fred Miranda was intended as a field's test of that cameras, so I guess is logical he focused checking features even if they weren't absolutely necessary for that picture...
Regards
http://www.dofmaster.com/dofjs.html
With a circle of confusion of 0,004 mm (just below the D800 pixel size), a 28 mm at f8, focused at 100 m (counting as infinite, I'd say wide angles usually mark in the focusing ring 3 m as far distance before infinity), renders a focused field from 19,7m to infinity. In a 20 mm would be from 11,1 m to infinity.
Theoretically, you couldn't improve focus beyond 19,7 m because already is in focus in a camera with that resolution. So, in a wide landscape with a wide angle, there's not much critical focus here (in my opinion).
Anyway, I guess that post from Fred Miranda was intended as a field's test of that cameras, so I guess is logical he focused checking features even if they weren't absolutely necessary for that picture...
Regards