Sigma 18-200mm f/3.5-6.3 DC Macro OS HS M | C £290/$400
TH E MOST TRAVEL-FRIENDLY SIGMA SUPERZOOM
This 18-200mm lens is the smallest superzoom on test, measuring a mere 71x86mm. It’s also just 30g heavier than the unfeasibly lightweight Tamron 18-200mm, despite featuring a metal, rather than plastic, mounting plate. However, as with the larger Sigma 18-300mm C-class lens, the mount has no weather-seal ring.
Multiple aspherical elements help in downsizing the design, while SLD (Special Low Dispersion) elements boost sharpness and contrast, and help reduce fringing. Both Sigma lenses use an ultrasonic motor for autofocus. This helps keep size and weight to a minimum, but the focus ring rotates during autofocus and there’s no manual focus override. AF also isn’t quite as whisper-quiet as with Nikon’s ring-type systems.
The optical stabilizer works well and comes complete with auto panning detection. Wideaperture sharpness isn’t quite as good as from the less expensive Tamron 18-200mm at short to mid zoom settings, but about equal at the long end.