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Is f16 the same on different lenses?
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<blockquote data-quote="hark" data-source="post: 577555" data-attributes="member: 13196"><p>A simpler explanation than Sparky's is that the f/stops are ratios to the length of each lens. I'll use f/4 since the math is easier than f/16, but the principle is the same. </p><p></p><p>f/4 means that the diameter of the aperture of any lens is 1/4 the size of the lens. So if you have a 200mm lens, divide 200 by 4, and you wind up with 50mm. That means the diameter of the aperture on a 200mm lens when set at f/4 is 50mm. </p><p></p><p>Compare that with a 50mm lens with an aperture of f/4. Take 50 and divide by 4. The diameter of the aperture on a 50mm lens when set at f/4 is 12.5mm. </p><p></p><p>The smaller the diameter of the aperture, the more DOF you will have. So f/4 on a 50mm lens will allow greater DOF than f/4 on a 200mm lens. That's where the difference comes in when comparing f/stops. Your DOF will change when comparing different focal lengths.</p></blockquote><p></p>
[QUOTE="hark, post: 577555, member: 13196"] A simpler explanation than Sparky's is that the f/stops are ratios to the length of each lens. I'll use f/4 since the math is easier than f/16, but the principle is the same. f/4 means that the diameter of the aperture of any lens is 1/4 the size of the lens. So if you have a 200mm lens, divide 200 by 4, and you wind up with 50mm. That means the diameter of the aperture on a 200mm lens when set at f/4 is 50mm. Compare that with a 50mm lens with an aperture of f/4. Take 50 and divide by 4. The diameter of the aperture on a 50mm lens when set at f/4 is 12.5mm. The smaller the diameter of the aperture, the more DOF you will have. So f/4 on a 50mm lens will allow greater DOF than f/4 on a 200mm lens. That's where the difference comes in when comparing f/stops. Your DOF will change when comparing different focal lengths. [/QUOTE]
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Is f16 the same on different lenses?
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