Sigma's early wide-angle zoom for full-frame — the 17-35mm f/2.8-4 EX for Nikon DSLRs.
The Sigma 17-35mm f/2.8-4 EX DG HSM is an early wide-angle zoom for full-frame DSLRs, covering an ultra-wide to moderate wide-angle range. The variable f/2.8-4 aperture starts fast at the wide end where it matters most. It competed with the Nikon 17-35mm f/2.8 at a significantly lower price, targeting landscape and architecture photographers on a budget.
Optical performance is decent for its era. Centre sharpness is good at wider focal lengths and acceptable at the tele end. The EX designation indicates Sigma's professional tier. Distortion is moderate at 17mm. HSM motor provides fast, quiet autofocus. DG coatings reduce reflections from digital sensors. The f/2.8 starting aperture is useful at 17mm for interiors and astrophotography.
Nikon F mount. Filter thread is 82mm — large for a wide-angle zoom. Weight is approximately 660 grams. Build quality is solid with the EX professional designation. No image stabilisation. Several versions exist with minor improvements. The Sigma 12-24mm and Sigma 14-24mm Art have since replaced this range in Sigma's lineup with significantly improved optics.
Available on the used market at low prices — superseded by better alternatives. Check AF accuracy and smooth zoom operation. The 82mm filter thread is a nuisance. Adequate for budget wide-angle work but thoroughly outclassed by modern alternatives. The Sigma 14-24mm f/2.8 Art or Tamron 15-30mm f/2.8 are dramatically superior.