Wide-angle lenses are good for group shots.
Wide-angle lenses are a staple lens for many photographers, as these lenses can be used for landscapes, portraits, and tight indoor shots. Tokina is a third-party lens manufacturer that makes a variety of lenses for cameras offered by Canon and Nikon. The two lenses at the widest end of the spectrum offered by Tokina are an 11-16 and 12-24, both of which are DX lenses, so they are optimized for cameras with APS-C sensors. These lenses are not compatible with Nikon or Canon's full-frame sensor cameras.
Aperture
Both the 11-16 and the 12-24 have fixed, rather than floating, apertures. The 11-16 has an f/2.8, while the 12-24 has an f/4 aperture. As a result, the 11-16 will be able to shoot better in low light at comparable ISO settings than the 12-24. Photographers using the 11-16 will also be able to shoot hand-holding the camera at slower shutter speeds as a result of the better aperture.
Zoom
Both the 11-16 and the 12-24 are designed for APS-C cameras, which induce a crop factor of 1.5 on Nikon cameras and 1.6 on Canon cameras. The actual 35 mm zoom for the 11-16 is 16.5 to 24 on a Nikon and 17.6 to 25.6 on a Canon. The zoom range for the 12-24 is 18 to 36 on a Nikon and 19.2 to 38.4 on a Canon.
Construction
Both the 11-16 and the 12-24 are autofocus lenses, and you can switch between autofocus and manual focus on the fly with Tokina's One-Touch clutch mechanism, which allows you to move the focus ring back-and-forth to engage manual focus. Both the 12-24 lens and 11-16 have 13 lens elements in 11 groups, two of which are aspherical to reduce chromatic aberrations.
Specs
Both the 11-16 and 12-24 take 77 mm filters and lens caps. The 11-16 measures 3.3 inches wide by 3.5 inches long/84 mm by 89.5 mm and weighs 19.75 oz./560 grams. The 12-24 measures 3.3 inches wide by 3.5 inches long/84 mm by 89.5 mm and weighs 20.1 oz./570grams.
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