The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 400-800mm F6.3-8 and the Sony 300mm F2.8 G 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. Sony FE 400-800mm F6.3-8 is the longer of the two lenses at 346mm. The Sony 300mm F2.8 G with a length of 243mm, is 103mm shorter. On the other hand, the Sony 300mm F2.8 G has a larger diameter of 122mm compared to the Sony FE 400-800mm F6.3-8's 120mm 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. Sony 300mm F2.8 G weighs 2310g, 6% (165g) lighter than the Sony FE 400-800mm F6.3-8's weight of 2475g.
Filter Threads
The Sony FE 400-800mm F6.3-8 has a filter size of 105mm whereas the Sony 300mm F2.8 G has a 42mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sony FE 400-800mm F6.3-8:
And these are the 42mm filters that we recommend for the Sony 300mm F2.8 G:
Lens Mounts
The Sony FE 400-800mm F6.3-8 has the Sony E lens mount whereas the Sony 300mm F2.8 G has the Sony Alpha 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 Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Focal Range
Sony FE 400-800mm F6.3-8 has a focal range of 400-800mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
600 - 1200mm.
On the other hand, the Sony 300mm F2.8 G is a prime lens with fixed focal lenght of 300mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 450mm.
