The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 20mm F1.8 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. Samyang 20mm F1.8 is the longer of the two lenses at 88mm. The Panasonic 7-14mm F4 ASPH with a length of 83mm, is 5mm shorter. Besides being longer, the Samyang 20mm F1.8 also has a larger diameter of 83mm compared to the Panasonic 7-14mm F4 ASPH's 70mm 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 7-14mm F4 ASPH weighs 300g, 39% (197g) lighter than the Samyang 20mm F1.8's weight of 497g.
Lens Mounts
Both the Samyang 20mm F1.8 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.
Samyang 20mm F1.8 is also available in the Canon EF , Canon EF-M, Fujifilm X, Nikon F (FX), Pentax KAF, Samsung NX, Sony Alpha and Sony E mounts.
Focal Range
Samyang 20mm F1.8 is a prime lens with fixed focal lenght of 20mm.
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.
