Sigma's budget standard zoom — the basic 24-70mm f/3.5-5.0 for casual photography.
The Sigma 24-70mm f/3.5-5.0 Aspherical is a budget full-frame standard zoom with a variable aperture. The aspherical element provides some optical correction at the budget level. The unusual f/3.5-5.0 aperture range is slower than most competitors. Mount not specified. A basic alternative to constant-aperture standard zooms.
Optical performance is basic. The aspherical element helps at the wide end. Sharpness is acceptable in the centre. The slow variable aperture limits low-light use. Adequate for casual daytime photography. Not a lens to seek out — better options are available at every mount at similar or slightly higher prices.
Mount not specified — verify. Weight is approximately 280 grams — lightweight. Build quality is basic. No image stabilisation. The 24-70mm range is practical but the slow aperture limits its utility. Filter thread varies.
Very cheap. Verify mount. Not recommended for purchase — better alternatives readily available. Only at essentially zero cost. The aspherical element is the only distinguishing feature.