The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica TL 35mm F1.4 ASPH and the Irix 45mm F1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
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. Leica TL 35mm F1.4 ASPH weighs 428g, which means it is 497g (53%) lighter than the Irix 45mm F1.4 which has a weight of 925g.
Filter Threads
The Leica TL 35mm F1.4 ASPH has a filter size of 60mm whereas the Irix 45mm F1.4 has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 60mm filters that we recommend you to consider for the Leica TL 35mm F1.4 ASPH:
And these are the 77mm filters that we recommend for the Irix 45mm F1.4:
Lens Mounts
The Leica TL 35mm F1.4 ASPH has the Leica L lens mount whereas the Irix 45mm F1.4 has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Leica L Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Irix 45mm F1.4 is also available in Nikon F (FX) and Pentax KAF2 mounts.
Focal Range
Leica TL 35mm F1.4 ASPH is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of
52.5mm when used on a APS-C / DX format camera.
On the other hand, the Irix 45mm F1.4 is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 72mm.
