Leica 35mm F1.4 Summilux Asph. A Superlative 35mm Low Light Lens The Best Summilux ever created by Leica Interesting Optical design sports Unique Concave Front & Rear Elements Image Quality like the Summicron, but Faster   9 Elements in 5 Groups 1 Aspherical Element Filter Size is 46mm Apertures from F1.4 to F16 with Half clickstops Focuses from .7 Meters to Infinity Snap on Lens Hood and Cap provided Superb Low Light Image Quality and Doubles as a Standard Lens that is Excellent throughout the Aperture Range Great for Low light Scenics/Landscapes and Sunset/Sunrise, Cityscapes and Photojournalism