Originally posted by dofmaster I was looking at some photos I recently took and noticed that in some of the shots the face was out of focus when viewed at 100%. When I was checking the focus to see where the focus point was, it seemed that the centre and bottom half of the image appeared much sharper, which is odd because I would think that everything is roughly on a plane to the camera.
As noted above, the plane of focus is not parallel to the subject with the camera pointed downward. I estimate the distance to be about 5m with calculated DOF of about a meter (45cm near, 55cm far)
Originally posted by dofmaster Autofocus mode would be either AFS + single point or manual focus.
Assuming AF single point (center)*, the intended point of focus of IMGP5637 was at the top of the fly flap of her pants. Focus on that point is good with decent detail captured. Reasonable sharpness at full resolution viewing is maintained at the legs as far down as the knees, but decreasing paradoxically further down with the bricks/mortar continuing to show detail. The drop in sharpness moving up towards her head is much more abrupt and with nothing in reasonable focus (bricks included) much above the bottom hem of her top.** The area of acceptable focus is neither planar nor regular to the point of focus.
Assuming other lenses are functioning properly on the camera, it is safe to assume that the there may be a serious problem with this lens caused by a fault in element placement/alignment.
Steve
* Unfortunately the uploaded files have none of the makernotes that would have been helpful in determining what happened here. OOC TIFF, DNG, or PEF would have been preferable.
** This is counter to the camera angle. Expectation would be sharper bricks towards the top.
Last edited by stevebrot; 05-18-2018 at 12:57 PM.