50mm Prime with Resolution for a D800? Come on Nikon/Sigma!

Started Jan 4, 2014 | Questions thread
michaeladawson Forum Pro • Posts: 11,463
Re: 50mm Prime with Resolution for a D800? Come on Nikon/Sigma!

Scott McMorrow wrote:

Nexu1 wrote:

Nikon 50mm f1.8G: http://www.photozone.de/nikon_ff/631-nikkorafs5018ff?start=1

Sigma 35mm f1.4: http://www.photozone.de/nikon_ff/792-sigma3514dgfx?start=1

Both peak at 3900-4000.

Which are both about 20% below the maximum resolution of 4912 lw/ph of the D800 sensor.

One of the serious problems with the photozone.de resolution measurements is the way in which they measure border and corner resolution. What they do is to optimize focus in each zone, and then measure resolution. This neglects field curvature. Imatest MTF50 measurements made of the corners, when the center is in focus will be much lower than they report.

Aren't the Photozone MTF numbers determined from tests on a D3X camera?  And if so, then the capability of the lens hasn't been reached yet.

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Mike Dawson

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