Sigma14mm F1.8 DG HSM
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Sigma14mm F1.8 DG HSM

As you might expect, the 14mm F2.8 has a bulbous front element with a built-in lens hood. There's no filter thread, which is pretty standard for wide, fast primes. Optical construction is comprised of 16 elements, of which three are FLD (low dispersion) and four are SLD (super-low-dispersion).