The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summicron-T 23mm f2 ASPH and the Leica Summicron-M 28mm f2 ASPH 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. Leica Summicron-M 28mm f2 ASPH is the longer of the two lenses at 41mm. The Leica Summicron-T 23mm f2 ASPH with a length of 37mm, is 4mm shorter. On the other hand, the Leica Summicron-T 23mm f2 ASPH has a larger diameter of 63mm compared to the Leica Summicron-M 28mm f2 ASPH's 53mm 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. Leica Summicron-T 23mm f2 ASPH weighs 154g, which means it is 116g (42%) lighter than the Leica Summicron-M 28mm f2 ASPH which has a weight of 270g.
Filter Threads
The Leica Summicron-T 23mm f2 ASPH has a filter size of 52mm whereas the Leica Summicron-M 28mm f2 ASPH has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Leica Summicron-T 23mm f2 ASPH:
And these are the 46mm filters that we recommend for the Leica Summicron-M 28mm f2 ASPH:
Lens Mounts
The Leica Summicron-T 23mm f2 ASPH has the Leica L lens mount whereas the Leica Summicron-M 28mm f2 ASPH has the Leica M lens mount. Some of the latest released cameras that are compatible with these mounts are Leica TL2, Leica TL and Leica T Typ 701 for the Leica L Mount and Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Focal Range
Leica Summicron-T 23mm f2 ASPH is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of
34.5mm when used on a APS-C / DX format camera.
On the other hand, the Leica Summicron-M 28mm f2 ASPH is a prime lens with fixed focal lenght of 28mm.
