Canon EF 100-200mm f/4.5A - Canon EF Mount

The EF 100-200mm f/4.5A is a simplified telephoto zoom lens featuring a push-pull zoom mechanism and a dedicated AF motor. It was designed as a budget-friendly telephoto option for the EOS system, lacking a manual focus ring (manual focus is achieved via a switch and the AF motor). It remains a lightweight and straightforward option for outdoor photography in good light. Because this lens lacks a traditional manual focus ring, it is vital to ensure the AF motor is fully functional and responsive. The push-pull mechanism should be checked for excessive looseness. SDS ensures that the electronic contacts are clean and that the lens communicates correctly with modern EOS bodies, as older 'A' series lenses can sometimes exhibit compatibility issues.