Sigma's earlier constant f/2.8 APS-C zoom with macro — pre-OS version without stabilisation.
The Sigma 18-50mm f/2.8 EX DC Macro is a constant-aperture standard zoom for APS-C DSLR cameras from Sigma's EX (Excellence) line, which preceded the current Art/Contemporary product naming. The DC designation confirms APS-C-only coverage. Macro capability at minimum focus. Nikon F mount.
f/2.8 constant aperture. DC (APS-C coverage). EX line. Macro at minimum focus (close-focus capability beyond a standard zoom, not true 1:1). 67mm filter thread. At approximately 460g. Nikon F mount. Minimum focus approximately 0.2m.
The EX designation indicated Sigma's premium tier before the Global Vision Art/Contemporary/Sports restructuring of approximately 2012. The f/2.8 constant aperture across the standard zoom range (approximately 27-76mm equivalent on APS-C) provides consistent exposure and better low-light performance than variable-aperture kit zooms. The Macro close-focus capability increases versatility for product and detail photography.
On the used market the Sigma 18-50mm f/2.8 EX DC Macro Nikon F is an affordable older constant-aperture standard zoom. Condition checks: f/2.8 aperture smoothness and oil-on-blades, 67mm front element, zoom and focus ring smoothness, AF response. The Contemporary 17-50mm f/2.8 DC OS HSM or 18-50mm DC DN Art represent more current equivalents.