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<blockquote data-quote="WayneF" data-source="post: 396236" data-attributes="member: 12496"><p>If comparing 50mm f/1.4 with 50mm f/4, when both are stopped down to f/4, the 1.4 objective is NOT larger. It is blocked by the smaller f/4 aperture. Same effect as painting the glass rim black, or as the glass rim not being there. It is NOT f/1.4 if stopped down to f/4.</p><p></p><p>f/4 is f/4. This is the wonderful beauty of the f/stop system.</p><p></p><p>If comparing 200mm f/4 with 50mm f/4, both are f/4, but yes, the 200 mm aperture is 4x larger area, and does pass more light. Which has to travel 4x farther to the sensor, which sees a magnified telephoto view, 4x larger, but the view is 1/4 as wide. Illumination per unit area is the same.</p></blockquote><p></p>
[QUOTE="WayneF, post: 396236, member: 12496"] If comparing 50mm f/1.4 with 50mm f/4, when both are stopped down to f/4, the 1.4 objective is NOT larger. It is blocked by the smaller f/4 aperture. Same effect as painting the glass rim black, or as the glass rim not being there. It is NOT f/1.4 if stopped down to f/4. f/4 is f/4. This is the wonderful beauty of the f/stop system. If comparing 200mm f/4 with 50mm f/4, both are f/4, but yes, the 200 mm aperture is 4x larger area, and does pass more light. Which has to travel 4x farther to the sensor, which sees a magnified telephoto view, 4x larger, but the view is 1/4 as wide. Illumination per unit area is the same. [/QUOTE]
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