The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Kamlan 28mm F1.4 and the Panasonic 25mm F1.4 II 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. 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 the Kamlan 28mm F1.4's 55mm 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 25mm F1.4 II ASPH weighs 205g, 46% (179g) lighter than the Kamlan 28mm F1.4's 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 Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The Kamlan 28mm F1.4 has a filter size of 52mm whereas the Panasonic 25mm F1.4 II ASPH has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Kamlan 28mm F1.4:
And these are the 46mm filters that we recommend for the Panasonic 25mm F1.4 II ASPH:
Lens Mounts
Both the Kamlan 28mm F1.4 and the Panasonic 25mm F1.4 II 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-1 II, Panasonic G9 II and OM System OM-5.
Kamlan 28mm F1.4 is also available in Canon EF-M , Fujifilm X and Sony E mounts.
Focal Range
Kamlan 28mm F1.4 is a prime lens with fixed focal lenght of 28mm which has an effective (full-frame 35mm equivalent) focal range of
56mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic 25mm F1.4 II ASPH is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of 50mm when used on a FourThirds format camera.