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Comparison of microscope high-power field to digital high-power field. Microscope high-power field using Olympus BX43 with × 10 ocular and 20 mm diameter and × 40 objective lens, 0.196 mm2 (red circle); “×40” high-power field magnification on NDP.view WSI viewer (green rectangle) using 27” Philips monitor at 1920 × 1200 display resolution
