The type of photography that you are planning to use is an important decision factor. Here we have evaluated the 7artisans 25mm F1.8 and the Panasonic 42.5mm F1.7 OIS 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 42.5mm F1.7 OIS is the longer of the two lenses at 50mm. The 7artisans 25mm F1.8 with a length of 32mm, is 18mm shorter. Besides being longer, the Panasonic 42.5mm F1.7 OIS also has a larger diameter of 55mm compared to the 7artisans 25mm F1.8's 51mm diameter.
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Below you can find a scaled side-by-side image of 7artisans 25mm F1.8 and Panasonic 42.5mm F1.7 OIS to get a better idea of how their sizes compare in real life.
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 42.5mm F1.7 OIS weighs 130g, 9% (13g) lighter than the 7artisans 25mm F1.8's weight of 143g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Standard Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The 7artisans 25mm F1.8 has a filter size of 46mm whereas the Panasonic 42.5mm F1.7 OIS has a 37mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 46mm filters that we recommend you to consider for the 7artisans 25mm F1.8:
And these are the 37mm filters that we recommend for the Panasonic 42.5mm F1.7 OIS:
Lens Mounts
Both the 7artisans 25mm F1.8 and the Panasonic 42.5mm F1.7 OIS 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.
7artisans 25mm F1.8 is also available in Canon EF-M , Fujifilm X and Sony E mounts.
Focal Range
7artisans 25mm F1.8 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 APS-C / DX format camera.
On the other hand, the Panasonic 42.5mm F1.7 OIS is a prime lens with fixed focal lenght of 43mm which has an effective (full-frame 35mm equivalent) focal range of 86mm when used on a FourThirds format camera.