The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 10-25mm F1.7 and the Samyang 7.5mm F3.5 Fisheye MFT 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 10-25mm F1.7 is the longer of the two lenses at 128mm. The Samyang 7.5mm F3.5 Fisheye MFT with a length of 48mm, is 80mm shorter. Besides being longer, the Panasonic 10-25mm F1.7 also has a larger diameter of 88mm compared to the Samyang 7.5mm F3.5 Fisheye MFT'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. Samyang 7.5mm F3.5 Fisheye MFT weighs 197g, 71% (493g) lighter than the Panasonic 10-25mm F1.7's weight of 690g.
Lens Mounts
Both the Panasonic 10-25mm F1.7 and the Samyang 7.5mm F3.5 Fisheye MFT 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
Panasonic 10-25mm F1.7 has a focal range of 10-25mm and
2.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
20-50mm when used on a FourThirds format camera.
On the other hand, the Samyang 7.5mm F3.5 Fisheye MFT 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.
