Backfocus problems need to be fixed by Nikon?

Started Sep 11, 2012 | Discussions thread
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mosswings Veteran Member • Posts: 7,522
Re: Said it wrong

Mako2011 wrote:

BijouStGuy wrote:

Hi Mako,

Could you explain what you mean by "...the 35mm plane of focus falls outside the DOF consistently at f/1.8..". Thanks for your time.
Richard

I actually said it wrong. I should have said if the POINT OF FOCUS falls outside the DOF consistently. The plane of focus is the point directly between the farthest point that starts to show focus blur and the nearest point that shows focus blur (center of DOF). DOF is that range between closest in focus point and farthest in focus point. Ideally we want the point we focus on to coincide with the center of DOF or focus plain (with some minor caveats).

I think it's unacceptable if the Point of Focus consistently falls outside the DOF (and it can not be corrected by AF fine tune if the camera has that).....Nikon should fix that.

Thank you for correcting me. Hope I haven't confused more.

Mako, sorry to be persnickety, but technically it isn't possible for the point of focus to fall outside of the DOF. Depth of field is a derived phenomenon; it's the zone AROUND the point of focus that displays less than a certain amount of blur. I think that what you may be trying to say is that the positioning accuracy of the focus plane will be less than some fraction of the depth of field expected for that combination of FL, aperture, and subject distance.

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