|Sigma 200-500mm f/2.8 EX DG APO zoom lens|
Sigma has been putting out rather good lenses for the last few years. In particular, their Art line of prime and short zoom glass are very good value for the money. Later this year, Sigma may be ready to announce two more Art prime lens - 14mm f/1.8 and 135mm f/1.8
They have also gotten into Cine High Speed zoom lens and Super Zoom lens as well. As my readers know, Sigma and Tamron are third party lens manufacturers. They 'reverse engineer' Canon and Nikon cameras and manufacture after market lens that fit these models. However, sometimes there can be minor hiccups as Canon and Nikon keep trying to outsmart the 'imitators'.
For those who want to save some money and perhaps get a lens that has different focal length from what Canon and Nikon offer, Sigma and Tamron may be a good alternative. For those into wildlife photography, there was a good deal on eBay for the Sigma 150-600mm f/5-6.3 lens.
Many Sigma lenses sold in Europe have gone up in price rather substantially at the beginning of 2017. This list shows the old and new dealer prices for some lenses. below is a recent interview with Mr. Kazuto Yamaki, CEO of Sigma.