The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 9mm F1.7 ASPH and the Samyang 7.5mm F3.5 Fisheye MFT 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 9mm F1.7 ASPH is the longer of the two lenses at 52mm. The Samyang 7.5mm F3.5 Fisheye MFT with a length of 48mm, is 4mm shorter. Besides being longer, the Panasonic 9mm F1.7 ASPH also has a larger diameter of 61mm compared to the Samyang 7.5mm F3.5 Fisheye MFT'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. Panasonic 9mm F1.7 ASPH weighs 130g, which means it is 67g (34%) lighter than the Samyang 7.5mm F3.5 Fisheye MFT which has a weight of 197g.
Lens Mounts
Both the Panasonic 9mm F1.7 ASPH and the Samyang 7.5mm F3.5 Fisheye MFT 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.
Focal Range
Panasonic 9mm F1.7 ASPH is a prime lens with fixed focal lenght of 9mm which has an effective (full-frame 35mm equivalent) focal range of
18mm when used on a FourThirds format camera.
On the other hand, the Samyang 7.5mm F3.5 Fisheye MFT 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.