The Sigma 8–16mm lens is an enthusiast-level, ultra wide-angle rectilinear zoom lens made by Sigma Corporation specifically for use with APS-C small format digital SLRs. It is the first ultrawide rect
The lens is equipped with a built in lens hood. It comes with a front cap, a ring to mount the front cap and a rear cap.
20120904 Canon Rebel T3i with Sigma 8 16mm f 4.5 5.6 DC HSM lens 2
20120904 Canon Rebel T3i with Sigma 8 16mm f 4.5 5.6 DC HSM lens and sleeve 2
Focal length
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The focal length of an optical system is a measure of how strongly the system converges or diverges light; it has units of length, and for an idealized thin lens is equal to the distance between the l
Sketch of human eye showing rear focal length f′ and EFL
28 mm lens
50 mm lens
70 mm lens