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Lenses
Telephoto
Noob question - focal length vs aperture
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<blockquote data-quote="Samsonite" data-source="post: 126446" data-attributes="member: 13264"><p>Hi all, I've had a burning question which I couldn't find the answer on the Internet... </p><p></p><p>Taking for example a telephoto lens, for simplicity's sake, let's say its a 70 - 200mm F2.8. Even though the Aperture is fixed at 2.8, am I right in saying that you would get more light to the sensor at 70mm than at 200mm? My thinking is the more extended the lens is, the harder it is for light to get to the sensor? For example take a toilet role and a long carton tube of the same diameter, you get more light trough the end of toilet roll coz its shorter... Am I right in think the above? Or completely wrong?</p><p></p><p>Thanks!</p><p></p><p></p><p></p><p></p><p>Sent from my iPhone using Tapatalk!</p></blockquote><p></p>
[QUOTE="Samsonite, post: 126446, member: 13264"] Hi all, I've had a burning question which I couldn't find the answer on the Internet... Taking for example a telephoto lens, for simplicity's sake, let's say its a 70 - 200mm F2.8. Even though the Aperture is fixed at 2.8, am I right in saying that you would get more light to the sensor at 70mm than at 200mm? My thinking is the more extended the lens is, the harder it is for light to get to the sensor? For example take a toilet role and a long carton tube of the same diameter, you get more light trough the end of toilet roll coz its shorter... Am I right in think the above? Or completely wrong? Thanks! Sent from my iPhone using Tapatalk! [/QUOTE]
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Noob question - focal length vs aperture
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