The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 12-40mm F2.8 PRO II and the Fujifilm 18-55mm F2.8-4 R LM 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. OM System 12-40mm F2.8 PRO II is the longer of the two lenses at 84mm. The Fujifilm 18-55mm F2.8-4 R LM OIS with a length of 70mm, is 14mm shorter. Besides being longer, the OM System 12-40mm F2.8 PRO II also has a larger diameter of 70mm compared to the Fujifilm 18-55mm F2.8-4 R LM OIS's 65mm diameter.
Below you can find a scaled side-by-side image of OM System 12-40mm F2.8 PRO II and Fujifilm 18-55mm F2.8-4 R LM OIS to get a better idea of how their sizes compare in real life.
Comparison image of the OM System 12-40mm F2.8 PRO II and the Fujifilm 18-55mm F2.8-4 R LM OIS Size and Weight 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. Fujifilm 18-55mm F2.8-4 R LM OIS weighs 310g, 18% (72g) lighter than the OM System 12-40mm F2.8 PRO II's weight of 382g.
Filter Threads
The OM System 12-40mm F2.8 PRO II has a filter size of 62mm whereas the Fujifilm 18-55mm F2.8-4 R LM OIS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the OM System 12-40mm F2.8 PRO II:
And these are the 58mm filters that we recommend for the Fujifilm 18-55mm F2.8-4 R LM OIS:
Lens Mounts
The OM System 12-40mm F2.8 PRO II has the Micro Four Thirds lens mount whereas the Fujifilm 18-55mm F2.8-4 R LM OIS has the Fujifilm X 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 Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Focal Range
OM System 12-40mm F2.8 PRO II has a focal range of 12-40mm and
3.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
24-80mm when used on a FourThirds format camera.
On the other hand, the Fujifilm 18-55mm F2.8-4 R LM OIS has a focal range of 18-55mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-82.5mm when used on a APS-C / DX format camera.
