The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax FA 50mm F1.4 and the Sigma 50mm F1.4 EX DG HSM 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. Sigma 50mm F1.4 EX DG HSM is the longer of the two lenses at 68mm. The Pentax FA 50mm F1.4 with a length of 41mm, is 27mm shorter. Besides being longer, the Sigma 50mm F1.4 EX DG HSM also has a larger diameter of 85mm compared to the Pentax FA 50mm F1.4's 65mm 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 FA 50mm F1.4 weighs 223g, which means it is 282g (55%) lighter than the Sigma 50mm F1.4 EX DG HSM which has a weight of 505g.
Filter Threads
The Pentax FA 50mm F1.4 has a filter size of 49mm whereas the Sigma 50mm F1.4 EX DG HSM has a 77mm 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 FA 50mm F1.4:
And these are the 77mm filters that we recommend for the Sigma 50mm F1.4 EX DG HSM:
Lens Mounts
The Pentax FA 50mm F1.4 has the Pentax KAF lens mount whereas the Sigma 50mm F1.4 EX DG HSM has the Pentax KAF3 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 , and for the Pentax KAF3 Mount.
Pentax FA 50mm F1.4 is also available in the Pentax KAF mount.
Sigma 50mm F1.4 EX DG HSM is also available in Canon EF , Sony Alpha, Sigma SA, Nikon F (FX) and Four Thirds mounts.
Focal Range
Both lenses have the same focal range of
50mm and the fastest aperture of
F1.4.
