Maximum aperture: key poi nts
Not all lenses have constant, wide maximum apertures…
Lens aperture values follow a fixed sequence of values from f/16 to f/11 to f/8 and so on. Your Nikon D-SLR can also set intermediate values, which we’ve shown above in smaller text between the main ones.
Professional-quality lenses usually offer wider maximum apertures than cheaper ‘consumer’ lenses – even lenses of the same focal length.
Professional zooms usually have constant maximum apertures through the zoom range
Cheaper ‘consumer’ zoom lenses will usually have a lower maximum aperture at full zoom than at their shortest length.