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MTF10 results for a simulated Otus

May 30, 2014 JimK Leave a Comment

I ran the simulated Otus 55mm f/1.4 though the suite of MTF10 tests, and I’ll show the same plats as in the previous post for both a simulated camera with a 4-way beam-splitter anti-aliasing filter and one wit no AA filter.

First, the 3 dimensional surface plots.

With no AA filter:

mtf10OtusSurf

With the AA filter:

mtf10OtusAASurf

Next, contour plots.

With no AA filter:

mtf10OtusCont

The flat vertical lines on the right hand side are regions where the MTF10 occurs above the Nyquist frequency, and that frequency is substituted.

With the AA filter:

mtf10OtusAACont

The AA filter insures that MTF10 always occurs below the Nyquist frequency.

Two dimensional families of curves.

With no AA filter:

mtf10Otus2D

With the AA filter:

mtf10OtusAA2D

And finally, the quiver plots with the arrows pointing at the direction of steepest ascent (with log-log scaling) and their lengths proportional to the slope in that direction.

With no AA filter:

mtf10OtusQuiver

With the AA filter:

mtf10OtusAAQuiver

The conclusion: for the simulated Otus, at any stop the most rapid route to greater resolution is in the direction of increased sensel density from those available in full frame cameras today, rather than moving the lens aperture to one with greater resolution.

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