The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Nikon Z 28-75mm F2.8 and the Pentax 40mm F2.8 XS Lens for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Nikon Z 28-75mm F2.8 is the longer of the two lenses at 121mm. The Pentax 40mm F2.8 XS Lens with a length of 9mm, is 112mm shorter. Besides being longer, the Nikon Z 28-75mm F2.8 also has a larger diameter of 75mm compared to the Pentax 40mm F2.8 XS Lens's 63mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Pentax 40mm F2.8 XS Lens weighs 45g, 92% (520g) lighter than the Nikon Z 28-75mm F2.8 's weight of 565g.
Lens Mounts
The Nikon Z 28-75mm F2.8 has the Nikon Z lens mount whereas the Pentax 40mm F2.8 XS Lens has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon ZR, Nikon Z5 II and RED Komodo-X 6K Z for the Nikon Z Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
Nikon Z 28-75mm F2.8 has a focal range of 28-75mm and
2.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 112.5mm.
On the other hand, the Pentax 40mm F2.8 XS Lens is a prime lens with fixed focal lenght of 40mm which has an effective (full-frame 35mm equivalent) focal range of 60mm when used on a APS-C / DX format camera.
