The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 8-25mm F4 Pro and the Olympus ED 9-18mm f4.0-5.6 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 8-25mm F4 Pro is the longer of the two lenses at 89mm. The Olympus ED 9-18mm f4.0-5.6 with a length of 73mm, is 16mm shorter. On the other hand, the Olympus ED 9-18mm f4.0-5.6 has a larger diameter of 80mm compared to the Olympus ED 8-25mm F4 Pro's 77mm 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 9-18mm f4.0-5.6 weighs 280g, 31% (131g) lighter than the Olympus ED 8-25mm F4 Pro's weight of 411g.
Filter Threads
Both the Olympus ED 8-25mm F4 Pro and the Olympus ED 9-18mm f4.0-5.6 have the same Filter thread size of 72mm.
Below are links to the 72mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Olympus ED 8-25mm F4 Pro has the Micro Four Thirds lens mount whereas the Olympus ED 9-18mm f4.0-5.6 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.
Olympus ED 9-18mm f4.0-5.6 is also available in Micro Four Thirds mount.
Focal Range
Olympus ED 8-25mm F4 Pro has a focal range of 8-25mm and
3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16-50mm when used on a FourThirds format camera.
On the other hand, the Olympus ED 9-18mm f4.0-5.6 has a focal range of 9-18mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 18-36mm when used on a FourThirds format camera.
