The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-300 F4.5-6.3 Di III and the Panasonic 100-300mm F4-5.6 II 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 70-300 F4.5-6.3 Di III is the longer of the two lenses at 148mm. The Panasonic 100-300mm F4-5.6 II with a length of 126mm, is 22mm shorter. Besides being longer, the Tamron 70-300 F4.5-6.3 Di III also has a larger diameter of 77mm compared to the Panasonic 100-300mm F4-5.6 II's 74mm diameter.
Below you can find a scaled side-by-side image of Tamron 70-300 F4.5-6.3 Di III and Panasonic 100-300mm F4-5.6 II to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 70-300 F4.5-6.3 Di III and the Panasonic 100-300mm F4-5.6 II Size and Weight 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 100-300mm F4-5.6 II weighs 520g, 4% (25g) lighter than the Tamron 70-300 F4.5-6.3 Di III's weight of 545g.
Filter Threads
Both the Tamron 70-300 F4.5-6.3 Di III and the Panasonic 100-300mm F4-5.6 II have the same Filter thread size of 67mm .
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Tamron 70-300 F4.5-6.3 Di III has the Sony E lens mount whereas the Panasonic 100-300mm F4-5.6 II 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 70-300 F4.5-6.3 Di III has a focal range of 70-300mm and
4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
105 - 450mm .
On the other hand, the Panasonic 100-300mm F4-5.6 II 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.
