The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 100-400mm F5.0-6.3 IS and the Panasonic 45-200mm F4-5.6 II Power 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. Olympus ED 100-400mm F5.0-6.3 IS is the longer of the two lenses at 206mm. The Panasonic 45-200mm F4-5.6 II Power OIS with a length of 100mm, is 106mm shorter. Besides being longer, the Olympus ED 100-400mm F5.0-6.3 IS also has a larger diameter of 86mm compared to the Panasonic 45-200mm F4-5.6 II Power OIS's 70mm diameter.
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Below you can find a scaled side-by-side image of Olympus ED 100-400mm F5.0-6.3 IS and Panasonic 45-200mm F4-5.6 II Power OIS to get a better idea of how their sizes compare in real life.
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. Panasonic 45-200mm F4-5.6 II Power OIS weighs 370g, 66% (750g) lighter than the Olympus ED 100-400mm F5.0-6.3 IS's weight of 1120g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Micro Four Thirds Mount for size comparison purposes.
Super Telephoto Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The Olympus ED 100-400mm F5.0-6.3 IS has a filter size of 72mm whereas the Panasonic 45-200mm F4-5.6 II Power OIS has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Olympus ED 100-400mm F5.0-6.3 IS:
And these are the 52mm filters that we recommend for the Panasonic 45-200mm F4-5.6 II Power OIS:
Lens Mounts
Both the Olympus ED 100-400mm F5.0-6.3 IS and the Panasonic 45-200mm F4-5.6 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-1 II, Panasonic G9 II and OM System OM-5.
Focal Range
Olympus ED 100-400mm F5.0-6.3 IS has a focal range of 100-400mm and
4.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
200-800mm when used on a FourThirds format camera.
On the other hand, the Panasonic 45-200mm F4-5.6 II Power OIS has a focal range of 45-200mm and 4.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 90-400mm when used on a FourThirds format camera.