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

Started 11 months ago | Questions thread
Scott McMorrow
Regular MemberPosts: 362
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Re: 50mm Prime with Resolution for a D800? Come on Nikon/Sigma!
In reply to michaeladawson, 11 months ago

You are right, they are tested with a D3X.  As a result, i have some real issues with the validity of these measurements.  They are much too close to the theoretical resolution of the D3X, and are supposedly based on pictures imported into ACR with no sharpening applied.  If that is the case, it is pretty much impossible to get an MTF50 result that is close to half the theoretical resolution of the sensor with Imatest, due to the rolloff of the AA filter.

They could be reporting MTF10, which is not what they say they are reporting.  Or Photozone could be using Imatest to compute MTF50 with optimal sharpening of the filtered image.  Without more information about which Imatest measurement is being used, and what the processing in ACR is, it is not possible to fully interpret these results.

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