Sigma's original 10-20mm f/4-5.6 ticked pretty much all the right boxes, and rapidly became a top seller for users of Canon, Nikon, Olympus, Pentax, Sigma and Sony bodies alike. There was a lot to love, from Sigma's fast and ultra-quiet HSM (hypersonic motor) autofocus with full-time manual override, to solid build and impressive image quality. To top this, the lens came at a knockdown price that put a few own-brand lenses to shame.



Link: Techradar