The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 25mm F1.7 E and the Rokinon 7.5mm f3.5 Fisheye 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. Viltrox 25mm F1.7 E is the longer of the two lenses at 56mm. The Rokinon 7.5mm f3.5 Fisheye with a length of 48mm, is 8mm shorter. Besides being longer, the Viltrox 25mm F1.7 E also has a larger diameter of 64mm compared to the Rokinon 7.5mm f3.5 Fisheye's 60mm 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 25mm F1.7 E weighs 170g, which means it is 27g (13%) lighter than the Rokinon 7.5mm f3.5 Fisheye which has a weight of 197g.
Lens Mounts
The Viltrox 25mm F1.7 E has the Sony E lens mount whereas the Rokinon 7.5mm f3.5 Fisheye has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Viltrox 25mm F1.7 E is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of
37.5mm when used on a APS-C / DX format camera.
On the other hand, the Rokinon 7.5mm f3.5 Fisheye is a prime lens with fixed focal lenght of 8mm which has an effective (full-frame 35mm equivalent) focal range of 16mm when used on a FourThirds format camera.
