EXCERPT page containing first few paragraphs. 2020-09-19 11:57:09
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The MTF chart for f/1.4 shows high central contrast which drops off steadily to the edges and corners. At least at the center, it should perform extremely well, but note that 30 lp/mm (green lines) cannot be compared directly to the 40 lp/mm used in Zeiss and Leica MTF charts, nor is the spectral weighting designated. Moreover, Zeiss charts are measured results from real lenses (not computed idealizations).
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