Sigma Lens Tests and Reviews Sigma Lens Tests and Reviews Sigma 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
Sigma 600mm F8 Mirror Lens Reviews - Sigma Lenses - Pentax Lens Review Database Sigma 600mm F8 Mirror reviews and specifications. Mount: Fixed K mount (not M42) Construction: large 6 element mirror lens in metal body Focal lengt. This is a Sigma Legacy Prime lens. ... Mount: Fixed K mount (not M42) Construction: large 6 element mirro