Has Nikon recalibrated your 85mm f/1.4G?

Started Nov 12, 2012 | Questions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 13,253
Re: Has Nikon recalibrated your 85mm f/1.4G?

just Tony wrote:

as predicted by Reikan FoCal was a whopping +23.

Monitors do not have constant light output, with different parts of the screen illuminated at different times, differences too slow for the eye to detect but AF sometimes can.

Testing AF via a target on a monitor is not always a smart move, particularly using short shutter speeds.

Put another way if your lens needs 23 at a particular aperture using manual focus the image needs to be obviously unsharp in the viewfinder (viewed wide open) to get a sharp image stopped down. If, with a none monitor target, the viewfinder and lens focus need no correction or are different to 23 suspect your calibration set up.

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Leonard Shepherd
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