The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax D-FA 50mm F2.8 Macro and the Carl Zeiss Biogon T2,8/25 ZM 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. Carl Zeiss Biogon T2,8/25 ZM is the longer of the two lenses at 71mm. The Pentax D-FA 50mm F2.8 Macro with a length of 60mm, is 11mm shorter. On the other hand, the Pentax D-FA 50mm F2.8 Macro has a larger diameter of 68mm compared to the Carl Zeiss Biogon T2,8/25 ZM's 53mm 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. Carl Zeiss Biogon T2,8/25 ZM weighs 260g, 1% (5g) lighter than the Pentax D-FA 50mm F2.8 Macro's weight of 265g.
Filter Threads
The Pentax D-FA 50mm F2.8 Macro has a filter size of 49mm whereas the Carl Zeiss Biogon T2,8/25 ZM has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 49mm filters that we recommend you to consider for the Pentax D-FA 50mm F2.8 Macro:
And these are the 46mm filters that we recommend for the Carl Zeiss Biogon T2,8/25 ZM:
Lens Mounts
The Pentax D-FA 50mm F2.8 Macro has the Pentax KAF lens mount whereas the Carl Zeiss Biogon T2,8/25 ZM has the Leica M lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Focal Range
Pentax D-FA 50mm F2.8 Macro is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75mm.
On the other hand, the Carl Zeiss Biogon T2,8/25 ZM is a prime lens with fixed focal lenght of 25mm.
