The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20mm F1.8 G and the Pentax 05 Toy Lens Telephoto 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. Sony FE 20mm F1.8 G is the longer of the two lenses at 85mm. The Pentax 05 Toy Lens Telephoto with a length of 20mm, is 65mm shorter. Besides being longer, the Sony FE 20mm F1.8 G also has a larger diameter of 74mm compared to the Pentax 05 Toy Lens Telephoto's 41mm 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 05 Toy Lens Telephoto weighs 18g, 95% (355g) lighter than the Sony FE 20mm F1.8 G's weight of 373g.
Lens Mounts
The Sony FE 20mm F1.8 G has the Sony E lens mount whereas the Pentax 05 Toy Lens Telephoto has the Pentax Q lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and , and for the Pentax Q Mount.
Focal Range
Sony FE 20mm F1.8 G is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30mm.
On the other hand, the Pentax 05 Toy Lens Telephoto is a prime lens with fixed focal lenght of 18mm which has an effective (full-frame 35mm equivalent) focal range of 81.9mm when used on a 1/1.7" format camera.
