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Old Jan 24, 2006, 12:27 PM   #1
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I was just thinking, if the aperture designation is a ratio related to the size of the front element, would f1.4 in a 35mm prime allow in as much light as f1.4 in an 85mm?

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Old Jan 24, 2006, 1:50 PM   #2
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The answer is yes to your question.

The amazing things about f-stop is that its lens & focal length independent.

If the scene is properly exposed on a huge 600mm at f/8 1/200, then you'll get exactly the same exposure with a 50mm at f/8 1/200. Needless to say, the actual aperture is very different between those two lenses.

Things like the Sunny-16 rule depend on this.

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