Options for everyone
There are superzooms to suit every type of Nikon interchangeable lens camera
Any zoom lens represents a bit of a compromise in image quality, compared with a fixed focal length prime lens. It’s only natural that the bigger zoom range of a superzoom lens tends to result in a greater compromise. However, recent designs aim to capitalize on tech advances, maximizing performance as well as versatility.
The use of ‘aspherical’ elements is a key factor. Instead of having the natural curve of a section of a sphere, these moulded or ground elements have irregular shapes. A single aspherical element can replace multiple spherical elements, reducing the size and weight of a camera lens.
Given that Nikon DSLRS and DX format Z-series mirrorless cameras don’t feature sensor-shift stabilization, optical image stabilization is all but essential. Indeed, the Z 24-200mm designed primarily for FX format Z-series cameras also features optical VR (Vibration Reduction).
We’ve come to accept autofocus as a way of life in digital photography. However, there are various competing systems on offer. Ring-type ultrasonic autofocus is based on a pair of large rings within the lens that are driven electromagnetically at ultrasonic frequencies. Performance tends to be quick and whisper-quiet and there’s a handling benefit too. The focus ring doesn’t rotate during autofocus, so you don’t need to keep your fingers clear while handholding the camera and lens. The same goes for the stepping motor-based systems of the
Z-mount Nikon lenses on test. With both systems, full-time manual override of autofocus is also available, without the need to switch from AF to MF.
The Sigma lens on test uses an ultrasonic motor-based autofocus systems. This enables a smaller, more compact physical construction than ring-type ultrasonic autofocus but the focus ring rotates during autofocus and doesn’t allow full-time manual override. Autofocus tends to be slower and more audible as well.
It’s the same situation with the Tamron 18-200mm and 18-400mm lenses on test. The Tamron 16-300mm is unusual in using an ultrasonic motor, yet still enabling a stationary focus ring with the availability of manual override.