The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 50-200mm F4-5.6 ED and the Sigma 50-200mm F4-5.6 DC OS 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 50-200mm F4-5.6 DC OS HSM is the longer of the two lenses at 102mm. The Pentax 50-200mm F4-5.6 ED with a length of 80mm, is 22mm shorter. Besides being longer, the Sigma 50-200mm F4-5.6 DC OS HSM also has a larger diameter of 74mm compared to the Pentax 50-200mm F4-5.6 ED's 69mm 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 50-200mm F4-5.6 ED weighs 272g, which means it is 148g (35%) lighter than the Sigma 50-200mm F4-5.6 DC OS HSM which has a weight of 420g.
Filter Threads
The Pentax 50-200mm F4-5.6 ED has a filter size of 49mm whereas the Sigma 50-200mm F4-5.6 DC OS HSM has a 55mm 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 50-200mm F4-5.6 ED:
And these are the 55mm filters that we recommend for the Sigma 50-200mm F4-5.6 DC OS HSM:
Lens Mounts
The Pentax 50-200mm F4-5.6 ED has the Pentax KAF lens mount whereas the Sigma 50-200mm F4-5.6 DC OS HSM 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.
Sigma 50-200mm F4-5.6 DC OS HSM is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Focal Range
Both lenses have the same focal range of
50-200mm and the fastest aperture of
F4.0 - F5.6.