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 X 35-100mm F2.8 II Power OIS for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Panasonic X 35-100mm F2.8 II Power OIS is the longer of the two lenses at 100mm. The OM System 40-150mm F4.0 PRO with a length of 99mm is 1mm shorter. On the other hand, the OM System 40-150mm F4.0 PRO has a larger diameter of 69mm compared to Panasonic X 35-100mm F2.8 II Power OIS's 67mm diameter.
Below you can find the scaled side by side image of OM System 40-150mm F4.0 PRO and Panasonic X 35-100mm F2.8 II Power OIS to get a better idea of how their size compare in real life.
Comparison image of OM System 40-150mm F4.0 PRO and Panasonic X 35-100mm F2.8 II Power OIS Size and Weight 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. Panasonic X 35-100mm F2.8 II Power OIS weighs 357g, 6% (25g) lighter than the OM System 40-150mm F4.0 PRO's weight of 382g.
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 OM System 40-150mm F4.0 PRO and Panasonic X 35-100mm F2.8 II Power 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 X 35-100mm F2.8 II Power OIS has a focal range of 35-100mm and 2.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 70-200mm when used on a FourThirds format camera.