The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus 4mm F2.8 FMFT and the Olympus 9mm F8 Fish-Eye 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. Venus 4mm F2.8 FMFT is the longer of the two lenses at 26mm. The Olympus 9mm F8 Fish-Eye with a length of 13mm, is 13mm shorter. Besides being longer, the Venus 4mm F2.8 FMFT also has a larger diameter of 61mm compared to the Olympus 9mm F8 Fish-Eye 's 56mm 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. Olympus 9mm F8 Fish-Eye weighs 30g, 77% (105g) lighter than the Venus 4mm F2.8 FMFT's weight of 135g.
Below you can find the dimension and weight table of the Wideangle Fisheye Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Ultra-Wideangle Lenses in Micro Four Thirds Mount for Size Comparison
Lens Mounts
Both the Venus 4mm F2.8 FMFT and the Olympus 9mm F8 Fish-Eye 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
Venus 4mm F2.8 FMFT is a prime lens with fixed focal lenght of 4mm which has an effective (full-frame 35mm equivalent) focal range of
8mm when used on a FourThirds format camera.
On the other hand, the Olympus 9mm F8 Fish-Eye is a prime lens with fixed focal lenght of 9mm which has an effective (full-frame 35mm equivalent) focal range of 18mm when used on a FourThirds format camera.
