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 10-20mm F4 L IS STM 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. Canon RF 10-20mm F4 L IS STM is the longer of the two lenses at 112mm. The AstrHori 6mm f2.8 with a length of 61mm, is 51mm shorter. Besides being longer, the Canon RF 10-20mm F4 L IS STM also has a larger diameter of 84mm 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. AstrHori 6mm f2.8 weighs 340g, which means it is 230g (40%) lighter than the Canon RF 10-20mm F4 L IS STM which has a weight of 570g.
Lens Mounts
Both the AstrHori 6mm f2.8 and the Canon RF 10-20mm F4 L IS STM 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 10-20mm F4 L IS STM has a focal range of 10-20mm 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 15 - 30mm.
