The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 7.5mm f3.5 Fisheye and the Panasonic 7-14mm F4 ASPH 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 7-14mm F4 ASPH is the longer of the two lenses at 83mm. The Rokinon 7.5mm f3.5 Fisheye with a length of 48mm, is 35mm shorter. Besides being longer, the Panasonic 7-14mm F4 ASPH also has a larger diameter of 70mm 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. Rokinon 7.5mm f3.5 Fisheye weighs 197g, which means it is 103g (34%) lighter than the Panasonic 7-14mm F4 ASPH which has a weight of 300g.
Lens Mounts
Both the Rokinon 7.5mm f3.5 Fisheye and the Panasonic 7-14mm F4 ASPH 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-3 Astro, OM System OM-5 II and OM System OM-3.
Focal Range
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.
On the other hand, the Panasonic 7-14mm F4 ASPH has a focal range of 7-14mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 14-28mm when used on a FourThirds format camera.
