Sigma's budget telephoto — the basic 70-300mm f/4-5.6 in unknown mount.
The Sigma 70-300mm f/4-5.6 is a generic listing of Sigma's budget telephoto zoom — one of the most mass-produced telephotos. Described across numerous mount-specific listings throughout this database. The 70-300mm covers standard to long telephoto. Mount not specified. Multiple versions exist — APO, DG, OS, and non-APO variants.
Basic Sigma telephoto quality. APO versions are better than non-APO. Sharpness acceptable at shorter focal lengths. Variable aperture. The OS versions add stabilisation. The specific version dramatically affects quality — APO DG OS is significantly better than basic non-APO. Verify the specific version and mount.
Mount not specified — verify. Multiple versions exist with different features. Weight varies. Build quality basic. Check if APO, DG, OS, or basic version. The version identification is critical for quality assessment. Filter thread typically 58mm.
Very cheap. Verify mount AND version. The APO DG OS version is significantly better than the basic. Not all Sigma 70-300mm lenses are equal. The specific version determines the quality level. Only at very low prices when the version is identified.