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Prime
Just got the 35mm 1.8 - why is it so small.
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<blockquote data-quote="Eye-level" data-source="post: 63834" data-attributes="member: 6548"><p>OK like I said 85/1.8 is 52mm...85/1.4 is 72mm...what is the difference in physical size there?</p><p></p><p>He is talking about size of lenses relative to each other not f stop. All I said is lenses that have larger front elements tend to be faster than ones with smaller front elements but it is not always so! It also depends on the distance to sensor or film plane and probably a ton of other things like lens designs and configuration.</p><p></p><p>I agree that at any given focal length the aperture determines the amount of light that gets to the sensor regardless of the size of the front element but faster glass allows you to have a bigger aperture and that usually means a bigger lens.</p></blockquote><p></p>
[QUOTE="Eye-level, post: 63834, member: 6548"] OK like I said 85/1.8 is 52mm...85/1.4 is 72mm...what is the difference in physical size there? He is talking about size of lenses relative to each other not f stop. All I said is lenses that have larger front elements tend to be faster than ones with smaller front elements but it is not always so! It also depends on the distance to sensor or film plane and probably a ton of other things like lens designs and configuration. I agree that at any given focal length the aperture determines the amount of light that gets to the sensor regardless of the size of the front element but faster glass allows you to have a bigger aperture and that usually means a bigger lens. [/QUOTE]
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Prime
Just got the 35mm 1.8 - why is it so small.
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