Leica APO-Telyt-M 135 f/3.4 Review
Disclosure: I own the Leica APO-Telyt-M 135 f/3.4 reviewed here. I purchased it with my own funds and am not sponsored by Leica or any other camera or lens manufacturer. All opinions are my own.
The Leica APO-Telyt-M 135 f/3.4 is a lens that defines the outer reaches of the M-system. Historically, 135mm was the “difficult” focal length for rangefinder photographers—a glass ceiling of sorts where the limitations of the optical focus patch met the physics of extreme telephoto magnification. However, with the introduction of the Leica M EV1, the narrative has shifted. By removing the traditional rangefinder in favor of a high-resolution integrated electronic viewfinder, Leica has unlocked the full potential of this apochromatic masterpiece.
Introduction
In the world of Leica, “APO” is more than a marketing term; it is a promise of technical perfection. The Leica APO-Telyt-M 135 f/3.4 was the longest lens in the M-catalog, and for years, it has been sidelined by many as too difficult to focus accurately. But for those who value the “Leica Look”—characterized by biting micro-contrast and a transparent color palette—this lens is the ultimate tool. Whether you are compressing a mountain range or isolating a subject in a crowded plaza, the Leica APO-Telyt-M 135 f/3.4 delivers images with a clarity that rivals medium-format systems.
What is the Leica APO-Telyt-M 135 f/3.4?
The Leica APO-Telyt-M 135 f/3.4 is a telephoto prime lens designed for the M-mount. Its optical formula is elegant in its simplicity: five elements in four groups. What makes it special is the use of specialized glass with anomalous partial dispersion, which ensures that all colors of the light spectrum meet at the same point on the sensor. This “Apochromatic” correction eliminates the purple and green fringing often seen in high-contrast edges.
While an f/3.4 maximum aperture might seem modest to those used to the f/1.4 Summilux line, this lens was designed for peak performance wide open. It is not a lens you stop down to get sharpness; it is a lens you stop down only to gain depth of field.
Build, Design, and Handling
True to the heritage of Wetzlar, the Leica APO-Telyt-M 135 f/3.4 is a triumph of mechanical engineering. It features:
- Materials: A robust combination of solid brass and anodized aluminum, giving it a reassuring weight of 450g.
- Dimensions: It measures roughly 104.7mm in length with a 49mm filter thread.
- Integrated Hood: A telescopic, built-in lens hood that extends with a simple twist, eliminating the need for bulky add-ons.
- Focusing: The focus ring has a long, precise throw of approximately 130°, allowing for the minute adjustments necessary for telephoto work.
In Use on the Leica M EV1
The Leica M EV1 represents a fundamental shift in how we interact with M-mount glass. One of the primary reasons I transitioned to the Leica M EV1 was the experience I had with the 50mm APO-Summicron-M. On a traditional rangefinder, the focus patch is a masterpiece of 1950s engineering, but it lacks the critical feedback required for high-resolution 60MP sensors.
Using the Leica APO-Telyt-M 135 f/3.4 on the Leica M EV1 with its integrated 5.76 million dot EVF is a revelation. On an optical rangefinder, the 135mm frame lines are a tiny box in the center of the finder, making composition a challenge. With the Leica M EV1, you get 100% frame coverage. More importantly, the ease of manual focusing with the EVF—utilizing focus peaking and magnification—removes the “guesswork” of the focus patch. You see exactly where the plane of focus falls, ensuring that every shot taken with the Leica APO-Telyt-M 135 f/3.4 is tack-sharp.
Image Quality
The image quality of the Leica APO-Telyt-M 135 f/3.4 can be summarized in one word: Clinical.
- Sharpness: It is remarkably sharp at f/3.4. The MTF charts (Modular Transfer Function) from Leica show that contrast remains high all the way to the edges of the frame.
- Color Purity: The APO correction means that there is virtually no chromatic aberration. This leads to cleaner files that require less post-processing.
- Bokeh: While f/3.4 sounds “slow,” the 135mm focal length provides incredible subject separation. The background fall-off is smooth and natural, creating a distinct three-dimensional pop.
- Distortion: There is almost zero measurable distortion, making this an excellent choice for architectural details where straight lines must remain straight.
Who is the Leica APO-Telyt-M 135 f/3.4 for?
This is a lens for the photographer who has outgrown the 35mm/50mm “street” comfort zone. It is specifically for:
- Landscape Photographers: Those who want to extract intimate details from a sprawling vista.
- Portraitists: Those who want the flattering compression of a long telephoto without the bulk of a modern DSLR lens.
- Tech-Savvy M Shooters: Photographers who embrace the Leica M EV1 and want to push its 60MP sensor to the absolute limit of its resolving power.
Final Thoughts
The Leica APO-Telyt-M 135 f/3.4 is an uncompromising piece of glass. In the past, it was a lens for the brave—those willing to squint at a tiny focus patch. Today, paired with the Leica M EV1, it is an accessible, high-performance telephoto that rounds out a professional kit. It offers a level of precision and “bite” that few lenses can match, proving that when Leica commits to an APO design, the results are nothing short of spectacular.
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