Quote Originally Posted by Daniel Browning
That's because the above web site assumes an 8x10 print size. If you blow the image up larger than that (such as by looking at 100% crops), the DOF will be thinner than what the web site says. If you print smaller (say, wallet size), the DOF will be deeper than it says.

Thanks for responding


I measured to the camera body, then progressivly moved backfrom the given distance taking sample shots.It wasseveral feetfurther away than thegiven hyperfocaldistance when the picture did come in to focus.


At the given distance it was out of focus on a 8 x 10 size, I did take this in to account when looking at the samples on my 24" monitor.


To curvature of field, I have noticed this with Macro shots having oof areas to the edges on full frame. Some attributed to thesubject not being flat but I wondered how much could be attributed to a curvature of the focal plane.