The type of photography that you are planning to use is an important decision factor. Here we have evaluated the AstrHori 6mm f2.8 and the Canon RF-S 10-18mm F4.5-6.3 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. AstrHori 6mm f2.8 is the longer of the two lenses at 61mm. The Canon RF-S 10-18mm F4.5-6.3 with a length of 45mm, is 16mm shorter. On the other hand, the Canon RF-S 10-18mm F4.5-6.3 has a larger diameter of 69mm compared to the AstrHori 6mm f2.8's 65mm 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. Canon RF-S 10-18mm F4.5-6.3 weighs 150g, 55% (190g) lighter than the AstrHori 6mm f2.8's weight of 340g.
Lens Mounts
Both the AstrHori 6mm f2.8 and the Canon RF-S 10-18mm F4.5-6.3 has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R6 V, Canon R6 III and Canon C50.
AstrHori 6mm f2.8 is also available in the Sony E , Nikon Z and Leica L mounts.
Focal Range
AstrHori 6mm f2.8 is a prime lens with fixed focal lenght of 6mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
9.6mm.
On the other hand, the Canon RF-S 10-18mm F4.5-6.3 has a focal range of 10-18mm and 1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16-28.8mm when used on a APS-C / DX format camera.
