I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
I recently picked up a mint copy of this lens from eBay and wanted to confirm performance using my USAF resolution wall charts at 1:51 repro ratio on my D850. The results well exceeded expectations. Wide open resolution was 80 lp/mm centrally and 56- lp/mm at the edge and corner when focused on the central chart. At f/2 and smaller, central resolution peaked at 88 lp/mm due to sensor resolution reaching it's limit, not necessarily from lens resolution limit. By f/4, far edge resolution dropped to 44+ lp/mm due to expected curvature of field but it actually picked up to 72+ lp/mm if the lens was autofocused on the edge target using Live View. The lesson is that you should always autofocus the lens on the intended subject if needed to be rendered as sharply as possible even if near the edge of the frame.
Apr 26, 2019 at 09:32 PM
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