Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Kamlan 28mm F1.4 is the longer of the two lenses at 65mm. The Panasonic 25mm F1.4 II ASPH with a length of 55mm is 10mm shorter. On the other hand, the Panasonic 25mm F1.4 II ASPH has a larger diameter of 63mm compared to Kamlan 28mm F1.4's 55mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Panasonic 25mm F1.4 II ASPH weighs 205g, which means it is 179g (46%) lighter than the Kamlan 28mm F1.4 which has a weight of 384g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Wideangle Prime Lenses in Micro Four Thirds Mount for Size Comparison
Both Panasonic 25mm F1.4 II ASPH and Kamlan 28mm F1.4 has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are Panasonic GH6, OM System OM-1 and Panasonic GH5 II.
Kamlan 28mm F1.4 is also available in Canon EF-M , Fujifilm X and Sony E mounts.
Panasonic 25mm F1.4 II ASPH is a prime lens with fixed focal lenght of 25mm which has a 35mm equivalent focal range of 50mm when used on a FourThirds format camera. Kamlan 28mm F1.4 is a prime lens with fixed focal lenght of 28mm which has a 35mm equivalent focal range of 50mm when used on a APS-C / DX format camera.