Sigma's older full-frame superzoom — 28-300mm with aspherical elements, no stabilisation.
The Sigma 28-300mm f/3.5-6.3D Aspherical IF is an older full-frame superzoom predating the DG and OS versions. It covers 28-300mm with aspherical elements and internal focus but without stabilisation or digital-optimised coatings.
Optically basic — acceptable at mid-focal lengths. No stabilisation — a significant limitation at 300mm. IF internal focus keeps barrel length constant. D-type on Nikon mount for distance communication. Aspherical elements.
Available for Nikon F and other mounts. Approximately 460g. D-type where applicable. IF internal focus. No stabilisation. Full-frame coverage. The pre-DG and pre-OS designation indicates older coating and no stabilisation.
Essentially free used. The DG Macro and OS versions improved significantly. Modern alternatives are dramatically better. Only for absolute budget needs. Check zoom mechanism for play.