The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony E 70-350mm F4.5-6.3 G OSS and the Sony FE 100-400mm F4.5-5.6 GM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sony FE 100-400mm F4.5-5.6 GM is the longer of the two lenses at 205mm. The Sony E 70-350mm F4.5-6.3 G OSS with a length of 142mm, is 63mm shorter. Besides being longer, the Sony FE 100-400mm F4.5-5.6 GM also has a larger diameter of 94mm compared to the Sony E 70-350mm F4.5-6.3 G OSS's 77mm diameter.
Below you can find a scaled side-by-side image of Sony E 70-350mm F4.5-6.3 G OSS and Sony FE 100-400mm F4.5-5.6 GM to get a better idea of how their sizes compare in real life.
Comparison image of the Sony E 70-350mm F4.5-6.3 G OSS and the Sony FE 100-400mm F4.5-5.6 GM Size and Weight The 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. Sony E 70-350mm F4.5-6.3 G OSS weighs 625g, which means it is 770g (55%) lighter than the Sony FE 100-400mm F4.5-5.6 GM which has a weight of 1395g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Sony E Mount for size comparison purposes.
Telephoto Zoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sony E 70-350mm F4.5-6.3 G OSS and the Sony FE 100-400mm F4.5-5.6 GM has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX30, Sony ZV-E10 and Sony A6600.
Focal Range
Sony E 70-350mm F4.5-6.3 G OSS has a focal range of 70-350mm and 5.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 105-525mm when used on a APS-C / DX format camera. Sony FE 100-400mm F4.5-5.6 GM has a focal range of 100-400mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 150 - 600mm.