The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Carl Zeiss Planar T1,4/50 and the Carl Zeiss Distagon T2/25 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 T2/25 is the longer of the two lenses at 95mm. The Carl Zeiss Planar T1,4/50 with a length of 69mm, is 26mm shorter. Besides being longer, the Carl Zeiss Distagon T2/25 also has a larger diameter of 71mm compared to the Carl Zeiss Planar T1,4/50's 66mm 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. Carl Zeiss Planar T1,4/50 weighs 350g, which means it is 220g (38%) lighter than the Carl Zeiss Distagon T2/25 which has a weight of 570g.
Lens Mounts
The Carl Zeiss Planar T1,4/50 has the Canon EF lens mount whereas the Carl Zeiss Distagon T2/25 has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount and Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Carl Zeiss Planar T1,4/50 is also available in Pentax KAF and Nikon F (FX) mounts.
Carl Zeiss Distagon T2/25 is also available in Canon EF mount.
Focal Range
Carl Zeiss Planar T1,4/50 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 80mm.
Carl Zeiss Distagon T2/25 is a prime lens with fixed focal lenght of 25mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 37.5mm.