I tested the Sigma 12mm f/1.4 – it's a perfectly portable prime for APS-C cameras, with a fast aperture for city and night shots

The world's widest autofocus lens for APS-C camera with f/1.4 aperture is a dream for astrophotography and city shots ...

I tested Sigma's f/1.8 zoom for APS-C cameras for a month – it's a prime lens killer with one drawback

The Sigma 17-40mm f/1.8 DC is a majorly impressive zoom lens, and fills a huge gap especially for the Canon RF-mount ...