

So why use a 35mm Leica lens with optics on any M body other than the M3? Well, if you wear glasses, like I do, you are unlikely to be able to view the entire 35mm frame in the finder all at once. The only likely exception is the M10 because Leica, as a compromise for making the camera body thinner, extended the lens mount about two millimeters, compromising the accuracy of the goggles. They choose the 50mm frame, including on the analog M2, M4, M5, M6, M7, M-A, MP, and even the digital M9 and M240. People who are familiar these Leica 35mm lenses with optics, which in addition to the Summicron f/2 also include two versions of the Summilux f/1.4 as well as two Summaron lens versions of f/2.8 and f/3.5, know that these lenses with optics work fine on just about any other Leica M model. So I acquired the Summicron 35mm f/2 with goggles. For the M3, because the widest finder frame is the 50mm one, if you want to use a 35mm lens without having to resort to an external finder, you have no choice other than the made-for-the-M3 Leica models with optics. While I love the 50mm focal length, I quickly found myself wanting a 35mm lens for street photography. The first Leica I ever bought was the M3, with a Summicron 50mm f/2 lens. 72x finder optimized for its 35mm frame that required no optics for 35mm lenses. It was only later that Leica offered the M2 with a. 91x 50mm finder frame, the widest it has, to a 35mm one.

The first generation Leica Summicron 35mm f/2 eight-element lens with attached optics, often called goggles, were made for the Leica M3 to convert its.
