The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 28mm F4.5 L and the SG-image 25mm F1.8 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. SG-image 25mm F1.8 is the longer of the two lenses at 32mm. The Viltrox 28mm F4.5 L with a length of 20mm, is 12mm shorter. Besides being longer, the SG-image 25mm F1.8 also has a larger diameter of 67mm compared to the Viltrox 28mm F4.5 L'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 28mm F4.5 L weighs 60g, which means it is 85g (58%) lighter than the SG-image 25mm F1.8 which has a weight of 145g.
Lens Mounts
The Viltrox 28mm F4.5 L has the Leica L lens mount whereas the SG-image 25mm F1.8 has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount.
SG-image 25mm F1.8 is also available in Nikon Z and Fujifilm X mounts.
Focal Range
Viltrox 28mm F4.5 L is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42mm.
On the other hand, the SG-image 25mm F1.8 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.
