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 Venus 15mm f4.5 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 Venus 15mm f4.5 with a length of 48mm, is 13mm shorter. On the other hand, the Venus 15mm f4.5 has a larger diameter of 70mm 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. Venus 15mm f4.5 weighs 308g, 9% (32g) lighter than the AstrHori 6mm f2.8's weight of 340g.
Below you can find the dimension and weight table of the Wideangle Fisheye Prime Lenses in Leica L Mount for size comparison purposes.
Ultra-Wideangle Lenses in Leica L Mount for Size Comparison
Lens Mounts
Both the AstrHori 6mm f2.8 and the Venus 15mm f4.5 has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE.
AstrHori 6mm f2.8 is also available in the Sony E , Nikon Z and Canon RF mounts.
Venus 15mm f4.5 is also available in Sony E , Nikon Z and Canon RF 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 1.5x crop, it provides a 35mm (FF) equivalent of
9mm.
On the other hand, the Venus 15mm f4.5 is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 22.5mm.
