Sigma 10-18mm f/2.8 DC DN Contemporary (Fuji X) vs Sigma 12mm F1.4 DC Contemporary (Fujifilm X)

The Sigma 10-18mm f/2.8 DC DN Contemporary (Fuji X) is a zoom (10-18mm) and the Sigma 12mm F1.4 DC Contemporary (Fujifilm X) is a 12mm prime. The zoom gives you framing flexibility from one lens; the prime trades that for a fixed focal length that's usually brighter (f/1.4 vs f/2.8) and lighter to carry. Choose flexibility or a fast single focal length.

Choose the Sigma 10-18mm f/2.8 DC DN Contemporary (Fuji X) if you need more reach — it goes to 18mm vs 12mm for distant subjects, wildlife and sport. Choose it if you want one-lens flexibility — a 10-18mm zoom covers what the fixed 12mm can't reframe. Choose it if you like close-focus work — 0.28x magnification vs 0.1x.

Choose the Sigma 12mm F1.4 DC Contemporary (Fujifilm X) if you want more light and background blur — f/1.4 is faster than f/2.8, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — a 12mm prime over a zoom.

Aperture: the Sigma 12mm F1.4 DC Contemporary (Fujifilm X) opens to f/1.4 vs the Sigma 10-18mm f/2.8 DC DN Contemporary (Fuji X)'s f/2.8 — more light and shallower depth-of-field.