Lens Lab
Promaster AF 18-200 mm f/ 3.5-6.3 XR EDO Aspherical
18–200mm · f/3.5–6.3
Overview
The Promaster AF 18-200 mm f/3.5-6.3 XR EDO Aspherical (rebadged Tamron) is a superzoom for APS-C DSLRs, offering convenience over image quality. Optical strengths include good sharpness at most focal lengths wide open, though distortion is significant—strong pincushion at 18mm and 50mm, with complex correction needed. Weaknesses include slow screw-drive autofocus and notable lateral chromatic aberration at telephoto. Build is compact with a zoom lock to prevent creep. It suits travelers or those wanting a single lens for casual use, but for better quality, two separate lenses are recommended.