The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony E 15mm F1.4 G and the Samyang AF 18mm F2.8 FE 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 E 15mm F1.4 G is the longer of the two lenses at 70mm. The Samyang AF 18mm F2.8 FE with a length of 61mm, is 9mm shorter. Besides being longer, the Sony E 15mm F1.4 G also has a larger diameter of 67mm compared to the Samyang AF 18mm F2.8 FE's 64mm 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. Samyang AF 18mm F2.8 FE weighs 145g, 33% (74g) lighter than the Sony E 15mm F1.4 G's weight of 219g.
Filter Threads
The Sony E 15mm F1.4 G has a filter size of 55mm whereas the Samyang AF 18mm F2.8 FE has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 55mm filters that we recommend you to consider for the Sony E 15mm F1.4 G:
And these are the 58mm filters that we recommend for the Samyang AF 18mm F2.8 FE:
Lens Mounts
Both the Sony E 15mm F1.4 G and the Samyang AF 18mm F2.8 FE has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A6700, Sony FX30 and Sony ZV-E10.
Focal Range
Sony E 15mm F1.4 G is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of
22.5mm when used on a APS-C / DX format camera.
On the other hand, the Samyang AF 18mm F2.8 FE is a prime lens with fixed focal lenght of 18mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 27mm.