Leica chose its first prime lens for the T mirrorless camera system wisely. The Leica Summicron-T 23mm f/2 ASPH. ($1,850) matches the field of view and light gathering capability of the quintessential Leica optic, the 35mm Summicron that has adorned many of its full-frame digital and 35mm rangefinder cameras. This new Summicron is an autofocus lens that covers a smaller APS-C image sensor, but it's quite compact and can focus closer than its M-mount cousins. And, while it doesn't deliver quite the impeccable performance that its price would dictate, it's a solid prime lens option for the T system, and one that does a better job capturing images with a shallow depth of field than the Vario-Elmar-T 18-56mm f/3.5-5.6 zoom that is also available for the T. The lens measures just 1.5 by 2.5 inches (HD) and weighs a mere 5.4 ounces. That's noticeably smaller than the Sony Carl Zeiss 24mm f/1.8 ($1,098.00 at Amazon) lens (2.4 by 2.5 inches, 7.9 ounces) that's available for the competin...
The Leica Summicron-T 23mm f/2 ASPH. is very compact and captures a lot of light, but you need to stop it down a bit for true edge-to-edge clarity.
Compact; Wide aperture; No distortion; Focuses to 1 foot
A little soft at f/2; Maximum aperture narrows at close focus distance; Expensive; Some color fringing when shooting JPG