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General Lenses
Why are there different objective lens sizes? 52 vs 72 etc.
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<blockquote data-quote="§am" data-source="post: 84067" data-attributes="member: 9187"><p>The front element is not only sized to accommodate the field-of-view but also for the maximum aperture. Since aperture is measured as a fraction of focal-length, a longer lens requires a physically larger aperture to reach the same F-stop.</p><p></p><p>(Taken from <a href="http://photo.stackexchange.com/questions/13387/why-is-the-front-element-of-a-telephoto-lens-larger-than-a-wide-angle-lens" target="_blank">Why is the front element of a telephoto lens larger than a wide angle lens? - Photography</a>)</p></blockquote><p></p>
[QUOTE="§am, post: 84067, member: 9187"] The front element is not only sized to accommodate the field-of-view but also for the maximum aperture. Since aperture is measured as a fraction of focal-length, a longer lens requires a physically larger aperture to reach the same F-stop. (Taken from [url=http://photo.stackexchange.com/questions/13387/why-is-the-front-element-of-a-telephoto-lens-larger-than-a-wide-angle-lens]Why is the front element of a telephoto lens larger than a wide angle lens? - Photography[/url]) [/QUOTE]
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Why are there different objective lens sizes? 52 vs 72 etc.
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