Sigma's budget DX superzoom for Nikon — the compact 18-200mm with screw-drive AF.
The Sigma 18-200mm f/3.5-6.3 DC is a compact superzoom for Nikon F-mount APS-C DSLRs. The D designation indicates screw-drive autofocus, requiring a body with a built-in AF motor. Covering a 27-300mm equivalent range, it offers the classic superzoom convenience of one-lens travel photography at a budget price point.
Optical performance is typical of budget superzooms. Centre sharpness is acceptable at moderate focal lengths but degrades at the extremes. Corner performance is weak throughout. No image stabilisation — a significant limitation at the telephoto end. The DC designation confirms APS-C-only coverage. Chromatic aberration and distortion are present but manageable.
Nikon F mount with screw-drive AF — will not autofocus on D3xxx/D5xxx series bodies. Filter thread is 62mm. Weight is approximately 405 grams — compact for the range. Build quality is basic plastic. Several versions exist with minor improvements. No weather sealing. The OS version with optical stabilisation is a significant improvement worth seeking out.
Very cheap on the used market. Check for smooth zoom operation and AF function. The screw-drive limitation restricts compatibility. A basic travel lens for older Nikon DX bodies. The Sigma 18-200mm f/3.5-6.3 DC OS HSM with optical stabilisation and HSM motor is the much better choice if available.