Sigma prime lenses have a reputation for offering high optical quality at affordable prices. As the largest of the third-party lens manufacturers, you're likely to see more Sigma lenses attached to digital SLRs than almost any other brand. See below for all models of Sigma prime lenses currently on the market. If you find any current Sigma prime lens missing from this list, please let us know, via email, at . (At some point, we may begin listing "classic" Sigma primes that are no longer in production, but have not begun doing so as yet.)