Sigma's early AF telephoto — the 75-200mm f/3.8 without mount specified.
The Sigma 75-200mm f/3.8 AF Zoom is an early AF telephoto from Sigma covering a compact 75-200mm range at constant f/3.8. The constant f/3.8 is the distinguishing feature — consistent and faster than typical variable-aperture alternatives. Mount not specified — verify before purchase. An early Sigma AF telephoto with the constant aperture advantage.
The constant f/3.8 provides consistent exposure — a practical advantage over variable alternatives. Sharpness acceptable. An early Sigma AF design. The 75-200mm range is compact telephoto. Build quality varies by era. The constant aperture is the sole distinguishing feature. Better Sigma telephoto options with OS and HSM exist.
Mount not specified — verify. Weight varies. Build quality varies by era. Constant f/3.8. The constant aperture is the practical advantage. No OS. The specific mount and era determine quality. Verify mount and check for smooth AF and zoom operation before purchase.
Very cheap. Verify mount. The constant f/3.8 is the advantage. Better Sigma options exist. Only at near-zero prices when better alternatives are unavailable. The constant aperture adds modest value over variable alternatives.