Leica M6 TTL

Overview

The Leica M6 TTL is the 1998 update to the M6 Classic that adds through-the-lens flash exposure metering as its headline feature. Mechanically the body is the same fully-mechanical M as its predecessor — cloth-curtain horizontal-travel shutter, brass top and bottom plates, manual film advance, mechanical timing — but to accommodate the added TTL flash electronics and a redesigned shutter dial, the top plate grew ~2.5 mm taller and the body weight grew ~40 g.^[1][2] The most polarizing change is unrelated to flash: the shutter speed dial now rotates the opposite direction from every previous M, aligning instead with the direction of the over/under-exposure arrows in the meter LED display.

The M6 TTL was discontinued in 2002 and succeeded by two parallel paths: the MP (2003), which returned to the M6 Classic's smaller top plate and original-direction shutter dial for buyers who wanted the mechanical M6 experience back, and the M7 (2002), which kept the M6 TTL's reversed dial direction and added aperture-priority autoexposure via electronic shutter timing. The reversed-dial convention then carried forward through the M8 / M9 / digital M era; the MP's original-direction dial remains an outlier today.

For photographers buying into the M system today, the M6 TTL is most often recommended for flash-intensive shooters (event photographers, photojournalists who use fill-flash) where the TTL flash control delivers genuine workflow value. Photographers without flash needs more often choose the M6 Classic or the MP — the TTL's bigger top plate and reversed dial are not free, and the cost is paid every shooting session.

Construction and build

• Body dimensions — 138 × ~79.5 × 33.5 mm (height +2 to 2.5 mm vs. M6 Classic).^[1][2]
• Body weight — ~625 g (~ +40 g vs. M6 Classic).^[1]
• Cloth horizontal-travel focal-plane shutter — speeds 1 s through 1/1000 s plus B. Mechanical timing, same shutter mechanism as the M6 Classic.
• X-flash sync at 1/50 s, with the 1/50 detent now sitting as an intermediate notch between 1/30 and 1/60 on the redesigned shutter dial.
• Materials — die-cast brass top and bottom plates (with chrome or black-chrome plating), vulcanite covering, chrome trim. Same lineage as the M6 Classic.

The M6 TTL is the last fully mechanical M produced as a stock model before the electronic-shutter M7 (2002). The MP (2003) is also fully mechanical but is conceptually a "back to basics" return to the M6 Classic feel rather than a successor in the M6 TTL line.

Distinguishing features (vs. M6 Classic)

TTL flash exposure metering

The headline feature. With a compatible Leica SF-system flash mounted (SF20, SF24D, plus subsequent models), the camera meters flash output through the lens during the actual exposure and signals the flash to cut off when the integrated flash energy is sufficient.^[1] The flash sensor is the same silicon photodiode that serves the ambient meter, repurposed for flash duration measurement.

What this does for you in practice:

• Fill-flash automation — set the camera to manual or sunny-16 ambient exposure, mount an SF24D, set flash to TTL mode, point the flash at the subject — the system meters the flash to balance with ambient.
• Indoor/event flash work — point-and-shoot reliability for flash exposure without manual flash power calculations.
• Bounce flash — the through-the-lens metering reads the actual reflected light returning to the film plane, so bounce surfaces (ceilings, walls) don't disrupt the exposure.

Without an SF-system flash, the camera operates as a manual M body — the TTL flash circuitry is dormant.

Reversed shutter speed dial

The M6 TTL's shutter dial rotates the opposite direction from every previous M body. Why: the shutter dial direction now matches the direction of the over/under-exposure arrows in the viewfinder LED display.^[2] On the M6 TTL, rotating the dial clockwise (as viewed from above) selects faster shutter speeds, mapping naturally to the over-exposure arrow's direction. On the M6 Classic and earlier, rotating the dial counterclockwise selected faster speeds — the directions of the arrow and the dial did not visually correspond.

The change is polarizing: photographers used to the M6 Classic's direction find the TTL "wrong" and disrupt-of-muscle-memory; photographers introduced to the M system on the M6 TTL find it intuitive. The MP (2003) reverted to the M6 Classic direction; the M7, M8, M9, and subsequent digital M bodies use the M6 TTL direction. So the M6 TTL is the inflection point of the whole convention.

Larger shutter dial diameter

The shutter dial is physically larger in diameter on the M6 TTL — partly to accommodate the new "OFF" detent (which turns off the meter; the M6 Classic uses a separate frame-counter-area button for the same purpose), partly for ergonomic reasons (the larger dial is easier to operate with the finger of a hand bracing the camera).

"OFF" position on shutter dial

The M6 TTL adds an explicit OFF position on the shutter dial (between B and 1 s on the dial). Setting the dial to OFF disables the meter; this saves battery life when the camera is stored. The M6 Classic relied on the meter's auto-shutoff timer; the M6 TTL gives explicit control.

All three viewfinder magnifications retained

The M6 TTL kept the M6 Classic's three viewfinder magnifications: 0.58× / 0.72× / 0.85×.^[1] Frameline coverage at each magnification is the same as on the M6 Classic. There is no functional viewfinder difference between the M6 Classic and the M6 TTL — the changes are confined to the shutter dial, top plate, and TTL flash circuitry.

Lens system context

Same Leica M-mount as every M body. Frameline display covers 28, 35, 50, 75, 90, 135 mm (paired display selected by mounted lens or via the preview lever). All M-mount lenses ever made work on the M6 TTL with full mechanical functionality.

Working notes

• TTL flash needs a compatible Leica SF flash. Generic third-party flashes work in manual mode (set flash power manually, calculate exposure with guide-number arithmetic) but can't access the TTL flash automation.
• Battery dependency is meter + flash circuitry only. A dead battery disables both the meter and TTL flash, but shutter operation remains fully mechanical.
• The reversed shutter dial is a real ergonomic factor. Photographers switching back and forth between an M6 TTL and an M6 Classic / M3 / M4 / MP find the muscle-memory disruption nontrivial. If you own an M6 Classic and add an M6 TTL (or vice versa), expect a learning curve.
• The taller top plate fits a wider thumb wheel for the shutter dial. Some photographers prefer the M6 TTL's grippier feel; others find the larger silhouette less elegant.
• Self-timer — mechanical, ~8–12 second delay, lever on the front of the body. Same as the M6 Classic.
• Common service items on a 20+-year-old body: same as M6 Classic (shutter timing drift, rangefinder alignment, light seals) plus TTL flash circuit faults (rare; if present, requires Leica or specialist repair). Leica specialist CLA: $350–550.

Used market and reliability

• Chrome M6 TTL (any magnification) — body only, working condition: $2,800–4,000 (US 2026 pricing). Slightly higher than M6 Classic chrome due to scarcity (1998–2002 production was shorter than 1984–1998).
• Black M6 TTL — body only, working condition: $3,200–4,500.
• M6 TTL 0.85× variant — body only, working condition: $3,500–5,500. The least-produced of the three magnifications; modest premium.
• M6 TTL 0.58× variant — body only, working condition: $3,200–5,000. Also less common; modest premium.
• Limited editions / commemoratives — various, typically $5,000+. Smaller numbers than M6 Classic commemoratives.

The M6 TTL trades at a slight discount to the M6 Classic in some markets (because experienced Leica photographers preference the Classic for its smaller top plate and conventional dial direction), and at a slight premium in other markets (because TTL flash is a real value-add for some shooting styles). Net result: M6 TTL pricing is similar to M6 Classic pricing, with edition-and-magnification variation the bigger price driver than Classic-vs-TTL.

Buying checklist: same as M6 Classic — rangefinder accuracy, shutter speed timing, light seal condition, shutter curtain integrity, meter circuit operation. Add: test TTL flash with a Leica SF24D (or borrow one from a dealer) before purchase; flash circuit faults are uncommon but expensive to repair.

Related cameras

• Leica M6 — the predecessor; smaller top plate, conventional shutter dial direction, no TTL flash
• Leica M3 — the founding M body
• Leica M4 — the working photographer's M

External references

• Leica M6 TTL (Camera-Wiki) — community-edited reference for TTL-specific specifications and dimensional changes from the M6 Classic
• Leica M6 (Wikipedia) — covers both M6 Classic and M6 TTL in a single article; reference for the shutter dial reversal and the +2 mm top plate