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| p.153 #7 · A7/A7r - performance with WA RF lenses |
Some excellent, educational points in this thread. For the Zeiss dedicated lenses on the A7R, I find these lenses exhibit none of the faults noted in this thread. Non-dedicated lenses are a different issue. In my limited testing so far I have found the determining factor for a non-dedicated lens on the A7R is the lens design, not the WA, not the focal length, not the RF/SLR format, etc. I have the Contax G 28, 45, 90 lenses. The G28 is Biogon, and creates aberration (the magenta shift). The G45 is Planar, and is perfect. The G90 is Sonnar and near perfect, but I can get it to exhibit very slight magenta shift in specific circumstances. I have tried many Leica lenses (all of Sonnar design), and all created magenta shift and other CA. I have tried various Japanese lenses with very mixed results, which are unpredictable due to non-disclosure of the lens design. I have tried EL lenses with excellent results from the Planar designs. I have tried Zeiss SLR format lenses, notably the WA Distagon designs gave perfect results. This led me to a conclusion for non-dedicated lenses. For best IQ results from the A7R, only the very best lenses may be used. The brand and designs that work perfectly, consistently, and predictably for me (without post-pro or in-camera profiles) are the Zeiss Planar and Distagon. The aim of this post is to express a personal conclusion: not to denigrate any particular brand. Others may have completely opposing results, views and conclusions.