The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 8mm F1.8 Fisheye and the Olympus ED 7-14mm f4.0 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. Olympus ED 7-14mm f4.0 is the longer of the two lenses at 120mm. The Olympus ED 8mm F1.8 Fisheye with a length of 80mm, is 40mm shorter. Besides being longer, the Olympus ED 7-14mm f4.0 also has a larger diameter of 87mm compared to the Olympus ED 8mm F1.8 Fisheye's 62mm 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 ED 8mm F1.8 Fisheye weighs 314g, which means it is 466g (59%) lighter than the Olympus ED 7-14mm f4.0 which has a weight of 780g.
Lens Mounts
The Olympus ED 8mm F1.8 Fisheye has the Micro Four Thirds lens mount whereas the Olympus ED 7-14mm f4.0 has the Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Olympus E-5, Olympus E-600 and Olympus E-620 for the Four Thirds Mount.
Focal Range
Olympus ED 8mm F1.8 Fisheye 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.
On the other hand, the Olympus ED 7-14mm f4.0 has a focal range of 7-14mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 14-28mm when used on a FourThirds format camera.
