The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 35mm F1.7 X and the Pentax 50-200mm F4-5.6 ED WR 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. Pentax 50-200mm F4-5.6 ED WR is the longer of the two lenses at 80mm. The Viltrox 35mm F1.7 X with a length of 56mm, is 24mm shorter. Besides being longer, the Pentax 50-200mm F4-5.6 ED WR also has a larger diameter of 69mm compared to the Viltrox 35mm F1.7 X's 64mm 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. Viltrox 35mm F1.7 X weighs 180g, which means it is 105g (36%) lighter than the Pentax 50-200mm F4-5.6 ED WR which has a weight of 285g.
Filter Threads
The Viltrox 35mm F1.7 X has a filter size of 52mm whereas the Pentax 50-200mm F4-5.6 ED WR has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Viltrox 35mm F1.7 X:
And these are the 49mm filters that we recommend for the Pentax 50-200mm F4-5.6 ED WR:
Lens Mounts
The Viltrox 35mm F1.7 X has the Fujifilm X lens mount whereas the Pentax 50-200mm F4-5.6 ED WR has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
Viltrox 35mm F1.7 X is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of
52.5mm when used on a APS-C / DX format camera.
On the other hand, the Pentax 50-200mm F4-5.6 ED WR has a focal range of 50-200mm and 4.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-300mm when used on a APS-C / DX format camera.
