The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 14mm F2.5 II ASPH 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. Panasonic 14mm F2.5 II ASPH is the longer of the two lenses at 21mm. The Pentax 40mm F2.8 XS Lens with a length of 9mm, is 12mm shorter. On the other hand, the Pentax 40mm F2.8 XS Lens has a larger diameter of 63mm compared to the Panasonic 14mm F2.5 II ASPH's 56mm 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, 18% (10g) lighter than the Panasonic 14mm F2.5 II ASPH's weight of 55g.
Lens Mounts
The Panasonic 14mm F2.5 II ASPH has the Micro Four Thirds 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 OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
Panasonic 14mm F2.5 II ASPH is a prime lens with fixed focal lenght of 14mm which has an effective (full-frame 35mm equivalent) focal range of
28mm when used on a FourThirds format camera.
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.
