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Photography Q&A
Help me understand FX vs. DX
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<blockquote data-quote="480sparky" data-source="post: 519319" data-attributes="member: 15805"><p>No. Focal length has nothing to do with how much light is passed through the lens.</p><p></p><p>A 100mm f/2.8 lens will pass the exact same amount of light as a 200mm f/2.8, or a 300mm f/2.8 or a 400mm f/2.8.</p><p></p><p>However, designing longer focal length lenses and maintaining larger aperture creates larger, heavier and consequentially more expensive results. So to reduce size, weight and price tags, the maximum apertures start to get smaller as you get into the longer focal lengths. This is a function of economy and marketing.</p></blockquote><p></p>
[QUOTE="480sparky, post: 519319, member: 15805"] No. Focal length has nothing to do with how much light is passed through the lens. A 100mm f/2.8 lens will pass the exact same amount of light as a 200mm f/2.8, or a 300mm f/2.8 or a 400mm f/2.8. However, designing longer focal length lenses and maintaining larger aperture creates larger, heavier and consequentially more expensive results. So to reduce size, weight and price tags, the maximum apertures start to get smaller as you get into the longer focal lengths. This is a function of economy and marketing. [/QUOTE]
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Help me understand FX vs. DX
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