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General Photography
Low Light & Night
Help with the Looney 11 rule
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<blockquote data-quote="480sparky" data-source="post: 294262" data-attributes="member: 15805"><p>You're thinking of variable aperture zooms, like the 18-55 or 55-200 and such. The reason their apertures reduce at longer focal lengths is strictly a mechanical issue. The aperture blades physically move away from the camera, hence the opening becomes visually smaller as seen from the camera.</p><p></p><p>Not all zooms are variable aperture. There's lots of them, like the Nikon Trinity lenses, that do not change their apertures during zooming.</p></blockquote><p></p>
[QUOTE="480sparky, post: 294262, member: 15805"] You're thinking of variable aperture zooms, like the 18-55 or 55-200 and such. The reason their apertures reduce at longer focal lengths is strictly a mechanical issue. The aperture blades physically move away from the camera, hence the opening becomes visually smaller as seen from the camera. Not all zooms are variable aperture. There's lots of them, like the Nikon Trinity lenses, that do not change their apertures during zooming. [/QUOTE]
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Help with the Looney 11 rule
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