The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Carl Zeiss Makro-Planar T2/50 and the Pentax DA 55mm F1.4 SDM 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 Makro-Planar T2/50 is the longer of the two lenses at 88mm. The Pentax DA 55mm F1.4 SDM with a length of 66mm, is 22mm shorter. Besides being longer, the Carl Zeiss Makro-Planar T2/50 also has a larger diameter of 72mm compared to the Pentax DA 55mm F1.4 SDM's 70mm 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 DA 55mm F1.4 SDM weighs 375g, 29% (155g) lighter than the Carl Zeiss Makro-Planar T2/50's weight of 530g.
Filter Threads
The Carl Zeiss Makro-Planar T2/50 has a filter size of 67mm whereas the Pentax DA 55mm F1.4 SDM has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Carl Zeiss Makro-Planar T2/50:
And these are the 58mm filters that we recommend for the Pentax DA 55mm F1.4 SDM:
Lens Mounts
The Carl Zeiss Makro-Planar T2/50 has the Pentax KAF lens mount whereas the Pentax DA 55mm F1.4 SDM has the Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and , and for the Pentax KAF3 Mount.
Carl Zeiss Makro-Planar T2/50 is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Carl Zeiss Makro-Planar T2/50 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 Pentax DA 55mm F1.4 SDM is a prime lens with fixed focal lenght of 55mm which has an effective (full-frame 35mm equivalent) focal range of 82.5mm when used on a APS-C / DX format camera.