The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 28-200mm F2.8-5.6 Di III and the Panasonic 45-175mm F4.0-5.6 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. Tamron 28-200mm F2.8-5.6 Di III is the longer of the two lenses at 117mm. The Panasonic 45-175mm F4.0-5.6 OIS with a length of 90mm, is 27mm shorter. Besides being longer, the Tamron 28-200mm F2.8-5.6 Di III also has a larger diameter of 74mm compared to the Panasonic 45-175mm F4.0-5.6 OIS's 62mm diameter.
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 45-175mm F4.0-5.6 OIS weighs 210g, 63% (366g) lighter than the Tamron 28-200mm F2.8-5.6 Di III's weight of 576g.
Filter Threads
The Tamron 28-200mm F2.8-5.6 Di III has a filter size of 67mm whereas the Panasonic 45-175mm F4.0-5.6 OIS has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 28-200mm F2.8-5.6 Di III:
And these are the 46mm filters that we recommend for the Panasonic 45-175mm F4.0-5.6 OIS:
Lens Mounts
The Tamron 28-200mm F2.8-5.6 Di III has the Sony E lens mount whereas the Panasonic 45-175mm F4.0-5.6 OIS has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Tamron 28-200mm F2.8-5.6 Di III has a focal range of 28-200mm and
7.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 300mm.
On the other hand, the Panasonic 45-175mm F4.0-5.6 OIS has a focal range of 45-175mm and 3.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 90-350mm when used on a FourThirds format camera.
