By Ked · May 2026
May 2026
The companion to our camera-side post on the Leica S bodies. If you are weighing the S system, the question is not just which lens to buy but how the whole system fits together: the mount, the sensor, the two lens families, and the leaf-shutter variants that set the S apart from a normal DSLR. This post explains the system. For current used pricing, the price guide does the heavy lifting, and we point to it where it matters.
Leica announced the S system at Photokina in September 2008 with the S2, and the gear shipped the following year. The concept was unusual: a camera shaped and handled like a 35mm DSLR, but built around a sensor larger than full frame. The S sensor measures roughly 30 by 45mm, between 35mm full frame and traditional medium format, which Leica calls "ProFormat." The result is a camera that gives you medium-format-style image quality and tonal depth in a body you can hold and shoot the way you would a professional 35mm SLR.
The lenses attach with the S bayonet, a mount Leica designed specifically for this system. It is proprietary and fully closed. Leica never licensed the S mount to any other manufacturer, and no third party such as Cosina ever produced an S-mount lens. Every S lens is a Leica lens, built to the standards Leica reserves for its most expensive professional optics. There are no budget options and no aftermarket alternatives.
The S line stayed small and evolved slowly. The original S2 (2009) used a CCD sensor. The S (Typ 006) refined it, the S-E (Typ 006) was a lower-cost variant, and the S (Typ 007) moved to a CMOS sensor with live view and video. The S3 is the current and final generation, with a higher-resolution CMOS sensor. All of these share the same S bayonet, so any S lens works on any S body. For the full body story, see the camera-side post linked above.
The S catalog is deliberately small, roughly nine primes and one zoom, but it is organized around a clear logic:
On top of the standard primes sit the specialist designs, which are the lenses the S system is most respected for:
The "APO" prefix on these designs signals apochromatic correction, which brings the red, green, and blue wavelengths to a common focus to suppress color fringing. It is the marker of Leica's most demanding optical work, and on the S it shows up exactly where it matters most: macro, telephoto, and tilt-shift.
The single most important structural feature of the S line is the CS distinction, and it affects every buying decision. Each Summarit-S and Elmarit-S prime exists in two parallel variants:
What the leaf shutter buys you is flash control. At 1/1000s sync you can shoot flash in bright daylight, overpower the sun, or drag the shutter to balance ambient and flash independently. For studio, fashion, product, and on-location flash work, that capability is half the job, so the CS variant is usually the right buy. For documentary, travel, and landscape photographers who do not shoot flash, the standard version is the better choice: identical optics, no leaf-shutter mechanism to ever fail, and a lower price. The CS variants trade at a premium over their standard siblings, sometimes a substantial one, which the price guide reflects.
The specialist lenses (the macro, the tilt-shift, and the APO-Elmar-S telephoto) generally do not have CS variants, because their use cases are far less flash-dependent.
Telling them apart when buying: the CS lenses carry the "CS" suffix in their name and in Leica's order numbers, so always check the exact model designation in a listing rather than the focal length alone. A "Summarit-S 70mm" and a "Summarit-S 70mm CS" are different lenses at different prices. If a listing is ambiguous, ask the seller for the order number or a photo of the lens barrel engraving before committing.
Because the S bayonet is closed, compatibility is simple: any S lens fits any S body, and nothing else fits either side. There is no native adapter path to mount S lenses on other systems with full function, and no way to put another maker's lens on an S body. With Leica having ended S development at the S3, the S is a self-contained system you buy into as a whole. That closed nature is a double-edged feature: it guarantees a uniformly excellent, well-matched lens set, but it also means there is no third-party escape hatch on price.
The S makes the most sense for photographers who want medium-format-grade files with DSLR handling, and who value the specific things the line does well: the apochromatic macro and telephoto, the tilt-shift for architecture, and the leaf-shutter flash capability. Studio and commercial shooters who live in flash get the most out of the CS lenses. Landscape, architecture, and portrait photographers who want the larger sensor and the optics, without the flash workflow, can build a strong standard-shutter kit.
The practical appeal in 2026 is the used market. Because the system is discontinued, S bodies and lenses now trade at a fraction of what they cost new, which puts medium-format-style Leica image quality within reach of serious enthusiasts, not just commercial studios. It is not for everyone: if you do not already want the larger sensor and the S handling, a 35mm system will be cheaper and more flexible. But for the photographer the S fits, the current used pricing makes it one of the more interesting ways into large-sensor work.
This post is the system explainer; the price guide is where the numbers live and stay current. For the zoom, see the Leica Vario-Elmar-S 30-90mm price guide, which tracks current used asks across all the sources we monitor. To compare every focal length side by side, browse current S-mount listings on UsedLensTracker by family, focal length, and condition.