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Forum: Pentax SLR Lens Discussion 07-02-2015, 09:00 AM  
Fixed aperture lens question
Posted By paulh
Replies: 14
Views: 1,616
What JinDesu said ^^. Many zooms are variable-aperture, meaning the aperture closes down as the focal length increases. For instance, the 18-55 kit lens max aperture at 18mm is f/3.5. When you zoom out to 55mm, the max aperture is only f/5.6.
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