The Leica Apo-Summicron-M is a high performance lens that is well suited for a variety of photographic applications. The 75 mm lens provides a more natural perspective when compared to a focal length of 90 mm, meaning it works perfectly for portraits shots, especially in more cramped locations. The aspherical surface of the Leica lens and high refractive index point the way to another advantage of the Leica Apo-Summicron-M, which is a brand new, high-precision adjusting mechanism and lens coating that serve to reduce internal reflection. This 75 mm lens by Leica has 6-bit coding; basically, what this does is make it possible for any digital M camera to "read" the Leica lens, identify it, and then use that lens in the best possible way. For photographers, that means that image quality is immediately improved and this information is written into the image file. With a myriad of advanced options, the Leica Apo-Summicron-M is the perfect lens option for those looking to stretch the limits of what their camera can do.