The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 40-150mm F4.0 PRO and the Panasonic 100-300mm F4-5.6 II OIS for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Panasonic 100-300mm F4-5.6 II OIS is the longer of the two lenses at 126mm. The OM System 40-150mm F4.0 PRO with a length of 99mm, is 27mm shorter. Besides being longer, the Panasonic 100-300mm F4-5.6 II OIS also has a larger diameter of 74mm compared to the OM System 40-150mm F4.0 PRO's 69mm diameter.
Below you can find a scaled side-by-side image of OM System 40-150mm F4.0 PRO and Panasonic 100-300mm F4-5.6 II OIS to get a better idea of how their sizes compare in real life.
Comparison image of the OM System 40-150mm F4.0 PRO and the Panasonic 100-300mm F4-5.6 II OIS Size and Weight The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. OM System 40-150mm F4.0 PRO weighs 382g, which means it is 138g (26%) lighter than the Panasonic 100-300mm F4-5.6 II OIS which has a weight of 520g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Micro Four Thirds Mount for size comparison purposes.
Telephoto Zoom Lenses in Micro Four Thirds Mount for Size Comparison
Lens Mounts
Both the OM System 40-150mm F4.0 PRO and the Panasonic 100-300mm F4-5.6 II OIS 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-5, Panasonic GH6 and OM System OM-1.
Focal Range
OM System 40-150mm F4.0 PRO has a focal range of 40-150mm and 3.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 80-300mm when used on a FourThirds format camera. Panasonic 100-300mm F4-5.6 II OIS has a focal range of 100-300mm and 3.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 200-600mm when used on a FourThirds format camera.