The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 100-400mm F5.0-6.3 II and the Tamron 50-400mm F4.5-6.3 VC 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. OM System 100-400mm F5.0-6.3 II is the longer of the two lenses at 206mm. The Tamron 50-400mm F4.5-6.3 VC with a length of 183mm, is 23mm shorter. On the other hand, the Tamron 50-400mm F4.5-6.3 VC has a larger diameter of 89mm compared to the OM System 100-400mm F5.0-6.3 II's 86mm diameter.
Below you can find a scaled side-by-side image of OM System 100-400mm F5.0-6.3 II and Tamron 50-400mm F4.5-6.3 VC to get a better idea of how their sizes compare in real life.
Comparison image of the OM System 100-400mm F5.0-6.3 II and the Tamron 50-400mm F4.5-6.3 VC 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. Tamron 50-400mm F4.5-6.3 VC weighs 1155g, 11% (145g) lighter than the OM System 100-400mm F5.0-6.3 II's weight of 1300g.
Filter Threads
The OM System 100-400mm F5.0-6.3 II has a filter size of 72mm whereas the Tamron 50-400mm F4.5-6.3 VC has a 67mm 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 OM System 100-400mm F5.0-6.3 II:
And these are the 67mm filters that we recommend for the Tamron 50-400mm F4.5-6.3 VC:
Lens Mounts
The OM System 100-400mm F5.0-6.3 II has the Micro Four Thirds lens mount whereas the Tamron 50-400mm F4.5-6.3 VC has the Sony E lens mount . Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro , OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount.
Nikon Z mount.
Focal Range
OM System 100-400mm F5.0-6.3 II 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 Tamron 50-400mm F4.5-6.3 VC has a focal range of 50-400mm and 8.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75 - 600mm .
