_julian_ wrote:
My opinion is that the best bang for the buck for M lenses will be the A7 since the larger pixel wells are a more relaxed design less affected by light falloff and color shift. The low-pass filter/IR hot mirror can then be physically removed leaving only the thin IR absorption plate which will dramatically reduce corner smearing following the same principle that Leica use for their digital Ms.
I believe from posts earlier in this thread that the IR absorption layer is between the two layers of the OLPF, and that the second layer of the OLPF doubles as the sensor coverglass. Removing it leaves a very delicate surface underneath.
You would have to then source a replacement IR filter, but if you did this then yes you would reduce smearing with symmetrical lenses, but at the expense of performance with lenses designed for digital. The refractive properties of the filter stack cause a degree of field curvature that lens designers now take into account (attempting to induce the opposite curvature in the lens itself).
Nov 13, 2013 at 08:24 AM
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