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Nikon DSLR Cameras
D7200
I have a question.
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<blockquote data-quote="Horoscope Fish" data-source="post: 559331" data-attributes="member: 13090"><p>When a lens has a variable aperture, such as f/3.5-f/5.6 as on your 18-140mm, it means the longer the focal length, the smaller the maximum aperture. You can only shoot at the widest aperture, f/3.5 at 18mm or so. Beyond that and the maximum aperture starts to fall off to f/4, f/4.5, f/5.6 etc. as the focal length increases. </p><p></p><p>Constant aperture lenses, such as my Tamron 70-20mm f/2.8 Di VC USD don't do this; they maintain a single maximum aperture across the focal length. But that costs money. Sometimes a LOT of money depending on just how large a maximum aperture/focal length you want.</p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 559331, member: 13090"] When a lens has a variable aperture, such as f/3.5-f/5.6 as on your 18-140mm, it means the longer the focal length, the smaller the maximum aperture. You can only shoot at the widest aperture, f/3.5 at 18mm or so. Beyond that and the maximum aperture starts to fall off to f/4, f/4.5, f/5.6 etc. as the focal length increases. Constant aperture lenses, such as my Tamron 70-20mm f/2.8 Di VC USD don't do this; they maintain a single maximum aperture across the focal length. But that costs money. Sometimes a LOT of money depending on just how large a maximum aperture/focal length you want. [/QUOTE]
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Nikon DSLR Cameras
D7200
I have a question.
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