The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 15mm F4 ED AL L and the Carl Zeiss Distagon T2/28 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Carl Zeiss Distagon T2/28 is the longer of the two lenses at 93mm. The Pentax 15mm F4 ED AL L with a length of 40mm, is 53mm shorter. Besides being longer, the Carl Zeiss Distagon T2/28 also has a larger diameter of 64mm compared to the Pentax 15mm F4 ED AL L's 63mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Pentax 15mm F4 ED AL L weighs 189g, which means it is 331g (63%) lighter than the Carl Zeiss Distagon T2/28 which has a weight of 520g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Pentax KAF Mount for size comparison purposes.
Wideangle Prime Lenses in Pentax KAF Mount for Size Comparison
Lens Mounts
Both the Pentax 15mm F4 ED AL L and the Carl Zeiss Distagon T2/28 has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Carl Zeiss Distagon T2/28 is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Pentax 15mm F4 ED AL L is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of 22.5mm when used on a APS-C / DX format camera. Carl Zeiss Distagon T2/28 is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42mm.