The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 300mm f6.3 and the Panasonic Leica 42.5mm F1.2 OIS 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. Panasonic Leica 42.5mm F1.2 OIS is the longer of the two lenses at 77mm. The Samyang 300mm f6.3 with a length of 74mm, is 3mm shorter. Besides being longer, the Panasonic Leica 42.5mm F1.2 OIS also has a larger diameter of 74mm compared to the Samyang 300mm f6.3's 65mm 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. Samyang 300mm f6.3 weighs 318g, which means it is 107g (25%) lighter than the Panasonic Leica 42.5mm F1.2 OIS which has a weight of 425g.
Lens Mounts
Both the Samyang 300mm f6.3 and the Panasonic Leica 42.5mm F1.2 OIS has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-1 II, Panasonic G9 II and OM System OM-5.
Samyang 300mm f6.3 is also available in Canon EF-M , Fujifilm X and Sony E mounts.
Focal Range
Samyang 300mm f6.3 is a prime lens with fixed focal lenght of 300mm which has an effective (full-frame 35mm equivalent) focal range of
600mm when used on a FourThirds format camera.
On the other hand, the Panasonic Leica 42.5mm F1.2 OIS is a prime lens with fixed focal lenght of 43mm which has an effective (full-frame 35mm equivalent) focal range of 86mm when used on a FourThirds format camera.