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D800, 14-24/2.8 and Focal Testing

Ferguson

Cape Coral, US
5702 posts

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Ferguson Silver Member Fellow Ribbon awarded for the generous sharing of his high level expertise in the spirit of Nikonians Nikonian since 19th Aug 2004
Sat 28-Jul-12 09:16 PM


In another topic there was a lot of generalized discussion of Focal, to the extent useful here is one for a specific lens/camera combination if anyone else cares to try.

I did this test with the standard target at the left, center and right focus point, at 14mm and then at 24mm, at about 2.4m distance. Then I ran one more at a distant (30m) target.

These look concerning as it would appear I have inadequate adjustment capability to actually get the best focus. Most of these curves are still rising as they approach the left (-20) axis, and would seem to imply that I need a greater negative value than -20 to get the best look. In all cases except the 14mm/center Focal gave a -20 recommendation, and there it was -13 but a quite flat curve (i.e. -17 was close to the same value, though -20 was down quite a bit).

Focal, interestingly, hung in an infinite loop 4 times trying to do the right focus point at 24mm.

I've had quite good real world results with the 14-24 (adjusted to -18). So I am not too worried, but this makes me think my D800 really does have a focus issue, perhaps even at the center, to need such strongly negative adjustment. Or maybe it is the lens.

Does anyone have similar results from a D800/14-24/2.8 combination?



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