Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Panasonic 45-200mm F4-5.6 II Power OIS is the longer of the two lenses at 100mm. The Panasonic 45-175mm F4.0-5.6 OIS with a length of 90mm is 10mm shorter. Besides being longer, the Panasonic 45-200mm F4-5.6 II Power OIS also has a larger diameter of 70mm compared to Panasonic 45-175mm F4.0-5.6 OIS's 62mm diameter.
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 45-175mm F4.0-5.6 OIS weighs 210g, 76% (160g) lighter than the Panasonic 45-200mm F4-5.6 II Power OIS's weight of 370g.
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 Panasonic 45-200mm F4-5.6 II Power OIS and Panasonic 45-175mm F4.0-5.6 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 Panasonic GH6, OM System OM-1 and Panasonic GH5 II.
Focal Range
Panasonic 45-200mm F4-5.6 II Power OIS has a focal range of 45-200mm and 4.4X zoom ratio which has a 35mm equivalent focal range of 90-400mm when used on a FourThirds format camera. Panasonic 45-175mm F4.0-5.6 OIS has a focal range of 45-175mm and 3.9X zoom ratio which has a 35mm equivalent focal range of 90-350mm when used on a FourThirds format camera.