A – Photography & Imaging Resources

APO-Telyt lens resources, and moreā€¦

Leica's APO-Telyt lenses have been milestones of optical engineering. Even decades after their release, these highly corrected tele-photo optics are still able to match or even outperform much more recent designs. The manual focus lenses are mechanically solid and handle smoothly, and the emergence of mirrorless cameras has given them another opportunity to shine in the era of digital imaging. Check out the leads below to learn more about the APO-Telyts, as well as other photo gear.

Site news and updates

Update of the CAM-parator App: The new Nikon Z9 and has been added to the camera comparison tool. Hence, it is now possible to easily compare its relative size, sensor characteristics, and core features to other camera models. Just select your pair of comparators using the search boxes below and you will promptly see a corresponding side-by-side comparison.


    The APO-Telyt timeline


    Leica APO-Telyt-R 3.4/180mm

    leica apo telyt r 180mm 34 on a7r
    • First apochromatically corrected Leica lens;
    • Originally intended for military surveillance;
    • Front filter S7.5 (or E60 on later version);
    • Focus range from 2.5m to infinity;
    • Maximum magnification of 11.5;
    • Integrated, sliding lens hood;
    • Maximum diameter of 68mm (2.68 inch);
    • Overall length of 135mm (5.31 inch);
    • Weight of 750g (1.65 lb.);
    • More on the APO-Telyt-R 3.4/180mm.

    Leica APO-Telyt-R 2.8/280mm

    leica apo telyt r 280mm 28 on s2
    • Tele-photo lens with crisp rendering;
    • Construction with 8 elements in 7 groups;
    • Compatible with Leica's APO-Extenders;
    • Pistol stock to facilitate handhold shooting;
    • Front filter E112mm (or S5.5 drop-in);
    • Focus range from 2.5m (8.2 ft) to infinity;
    • Maximum diameter of 125mm (4.9 inch);
    • Overall length of 261mm (10.3 inch);
    • Weight of 2,750g (6.1 lb.);
    • More on the APO-Telyt-R 2.8/280mm.

    Leica APO-Telyt-R 2.8/400mm

    leica apo telyt r 400mm 28 on nex
    • Fast super-tele prime lens;
    • Construction with 11 elements in 9 groups;
    • Pre-selection of min focus distance possible;
    • Compatible with Leica's APO-Extenders;
    • Rear S5.5 drop-in filters;
    • Focus range from 4.7m (15.5 ft) to infinity;
    • Maximum diameter of 166mm (6.5 inch);
    • Overall length of 365mm (14.4 inch);
    • Weight of 5,880g (12.8 lb.);
    • More on the APO-Telyt-R 2.8/400mm.

    Leica APO-Telyt-R 4.0/280mm

    leica apo telyt r 280mm 40 on sl2
    • Telephoto prime with exceptional sharpness;
    • High contrast and color fidelity;
    • Drop-in filters S5.5 or front filters in E77;
    • Focus range from 1.7m (5.6 ft) to infinity;
    • Maximum magnification of 1:5;
    • Built-in, telescopic, rubber armored lens hood;
    • Maximum diameter of 88mm (3.46 inch);
    • Overall length of 208mm (8.19 inch);
    • Weight of 1,875g (4.13 lb);
    • More on the APO-Telyt-R 4.0/280mm.

    Leica APO-Telyt-R Module

    leica apo telyt r module 280 800mm
    • Modular system of focus units and heads;
    • Locking bayonet to attach focus unit to head;
    • Alternative matches result in different lenses;
    • Six focal lengths from 280mm to 800mm;
    • Pistol stock to facilitate handhold shooting;
    • Compatible with Leica's APO-Extenders;
    • Drop-in Series 6 rear filters;
    • ROM contacts for use with the R8 and R9;
    • Delivered with aluminum transport cases;
    • More on the APO-Telyt-R Module lenses.

    Leica APO-Telyt-M 3.4/135mm

    leica apo telyt m 135mm on m
    • Portrait tele for Leica's M rangefinder series
    • Longest focal length among M-lenses;
    • Excellent sharpness and color reproduction;
    • Focus range from 1.5m to infinity;
    • Front filter size of E49;
    • Integrated, sliding lens hood;
    • Maximum diameter of 58.5mm (2.3 inches);
    • Overall length of 104.8mm (4.12 inches);
    • Weight of 453g (1 lb.);
    • More on the APO-Telyt-M 3.4/135mm.

    Leica APO-Telyt-R 5.6/1600mm

    leica apo telyt r 1600mm 56 on r9
    • World's most expensive camera lens;
    • Custom-made for a Qatari Sheikh;
    • Price of more than 2 million USD;
    • Compatible with Leica's APO-Extenders;
    • Delivered with a twist-on lens hood;
    • Maximum diameter of 42cm (16.5 inches);
    • Overall length of 120cm (47 inches);
    • Weight of 60kg (132 lb.);
    • Prototype kept in the Leica museum;
    • More on the APO-Telyt-R 5.6/1600mm.

    Lens Compendiums

    leica noctilux m 75mm 125 on m10

    Canon EOS lenses: When Canon introduced autofocus with its EOS-line of single lens reflex cameras in 1987, it switched from the mechanically-coupled FD mount to the fully electronic EF mount. Lenses with this "Electro-Focus" bayonet have a dedicated electric motor built into the lens that handles the autofocus operation. This compendium provides a comprehensive listing of Canon's AF lenses.

    CONTAX lenses: CONTAX used to be one of the most illustrious camera brands. Carl Zeiss lenses for the CONTAX/Yashica mount were produced from 1975 to 2005, and competed in quality and price with Leica's R-system. Many of these excellent manual focus optics nowadays enjoy a second life when adapted for use on digital cameras. See this system description and listing for an overview of all Zeiss C/Y lenses.

    Four Thirds lenses: At a time when other manufacturers were still relying heavily on film-era optics, Olympus advertized its Four Thirds lenses as built for digital photography. The wide mount and short flange to focal plane distance made it possible to apply telecentric lens design principles for superior edge-to-edge sharpness. This article provides an overview of the FT system and lists the specs of all the lenses with a native FT-mount.

    Fujifilm X-mount lenses: Fujifilm has built up a comprehensive set of lenses for its APS-C mirrorless cameras. The line-up of primes and zooms is carefully crafted and aimed at the needs of the enthusiast photographer. This posts lists all the upcoming, new, and existing lenses for the X-mount and their core specifications.

    Leica M-mount lenses: Leica's rangefinder lenses are legendary. They are masterpieces of precision manufacturing and optical engineering. In lens tests, M-optics consistently come out at the very top. Click through for an overview of M-lenses from Leica, Voigtländer and other brands.

    Leica R-mount lenses: The R-series was Leica's flagship product line from 1964 to 2009. The main attraction of the system was arguably the catalog of superb R-mount lenses. This compendium lists all the available R-optics from Leica, as well as third party manufacturers.

    Micro Four Thirds lenses: MFT-lenses have rapidly gained a reputation for excellent imaging performance in a compact and light form factor. The lens mount is supported by Olympus and Panasonic, as well as a range of third party suppliers, including Sigma, Tamron and Tokina. All lenses for the system – autofocus and manual – are listed with their key characteristics in this compendium.

    Nikon AF lenses: Nikon introduced its first autofocus lenses in 1986. Initially, the autofocus was driven by a motor located inside the camera, but later the Nikkors obtained their own drive. The full catalog of F-mount autofocus lenses offers a variety of options and solutions for virtually all photography situations, as documented in this overview article.

    Soligor lenses: Soligor offered solid lenses at affordable prices as alternatives to OEM optics. The company actually did not produce its lenses, but commissioned them from Japan-based manufacturers, like Sun Optical or Tokina. The listing in this article reports the key specifications of most, if not all, Soligor lenses that were released between 1960 and 1990.

    Sony E-mount lenses: Sony's introduction of mirrorless cameras in 2010 was a major milestone for digital photography, but the E-mount was initially held back by a lack of native lenses. This deficit has over time been addressed with Sony, Zeiss and other third party suppliers launching a considerable number of optics for the system. Read on to learn about the existing catalog of E-mount lenses and how their specs compare.

    Tamron Adaptall lenses: The Adaptall interchangeable mount makes it possible to use a lens with cameras from different brands by switching out camera-specific custom fittings. Tamron introduced this system in the mid-1970s and subsequently released more than 60 Adaptall lenses, before discontinuing its line of manual focus optics in 2006. Click through to learn more about this universal mount system and the lenses that are available for it.

    Vivitar lenses: Vivitar was a third party supplier that offered lenses for all the major camera brands from the 1960s to the 1990s. The company's premium Series 1 line was particularly popular for providing extraordinary features and superior imaging quality at an affordable price. Read this overview to learn more about Vivitar lenses and their specifications.


    Cameras and Camera Systems

    leica m10 detail

    Best Camera ELO: It is not easy to determine which camera is best. Indeed, what does it really mean to look for the best camera? The one with the highest sensor resolution and the best image quality? The one that is most portable and most enjoyable to use? The one that does not break the bank? The answers to these questions come down to personal preference and need, but this page provides a weighted, aggregate ELO rating, similar to the assessment of chess players, as well as links to other pages that can help to put some structure on the camera decision process.

    Camera comparisons: Camera technology is evolving quickly. New models pack ever more powerful features into more conveniently useable bodies. The online CAM-parator makes it possible to quickly compare the relative size of different cameras visually and provides a comparative overview of the key body, sensor, feature and connectivity specifications. See for yourself how your camera compares to other models...

    Camera shutter count: Knowing the number of photos that a digital camera has taken is useful as an indicator of use intensity and remaining shutter life expectancy. Second-hand buyers regularly ask for shutter count information to avoid overpaying for a heavily used, end-of-life camera. This online App displays the actuation count based on EXIF information contained in an uploaded image.

    Canon DSLR cameras: Canon has been the market leader for digital interchangeable cameras and offers models for virtually every purse and every purpose. The company has released more than 50 DSLRs since the early 2000s. This system overview shows the different models grouped into camera lines and makes it possible to easily compare key features and specifications.

    Four Thirds cameras: Olympus, Panasonic, and Leica released 18 different FT camera models between 2003 and 2010. Many of these were more compact and more feature-rich than competing APS-C cameras, but the smaller FT-sensor struggled to provide similar image quality. This compendium lists all the FT cameras with their core specifications, so comparisons across models and time are easy to make.

    Fujifilm X cameras: Fujifilm's X-system of cameras has gained many fans among enthusiast photographers since its launch in 2012. The combination of a retro-look with modern technology and comprehensive manual controls has inspired a strong and loyal following. Fujifilm has further developed and differentiated its models over time and this overview details the various model lines and highlights their differences.

    Leica M cameras: Leica's M-rangefinder cameras have maintained a consistent feel and appearance over time. Yet, the series has undergone a continuous evolution in terms of capabilities and features since the original M3 was launched in 1954. Find out in this compendium how the various film and digital M-models differ.

    Leica R and Leicaflex cameras: Leica produced single lens reflex cameras for its R-system from 1964 to 2009. New features and capabilities – big and small – were introduced with every new camera model. The release of an autofocus-capable R10 camera was envisaged, but eventually not pursued. The evolution of the system and the differences in camera specifications are highlighted in this compendium.

    Nikon DSLR cameras: Nikon boosts a proud history as a camera and lens producer. It has released more than 50 DSLRs since 1999, many of which work perfectly well with lenses from the film era. The company caters to the full range of photographers – from the casual shooter to the professional. This system overview shows all the different Nikon-DSLRs and their main features grouped by camera-line.

    Olympus MFT cameras: Olympus was a pioneer of the mirrorless revolution. Since 2009, the company has released a range of heritage-inspired cameras with modern, mirrorless technology that aim to conquer the hearts and wallets of different types of photographers. Four distinct camera lines exist: OMD, PEN, PL, and PM. This compendium shows all Olympus Micro Four Thirds cameras with their key specifications and pricing.

    Panasonic MFT cameras: When the Panasonic Lumix G1 was released as a mirrorless interchangeable lens camera in September 2008, it established the basis for what over time became the Micro Four Thirds system. Since then Panasonic has build up several distinct MFT camera lines: G, GH, GX, GF and GM. This overview article lists all of Panasonic's MFT cameras with their headline specs in chronological order.

    Sony E-Mount cameras: Sony has led the development of mirrorless APS-C and full-frame cameras and has steered up the photography industry with its innovation pace and short product cycle. The company's differentiated lines of full-frame models has been a particular challenge for Canon and Nikon. This compendium lists all of Sony's E and FE-mount cameras along with their main specifications.


    Accessories and Imaging Tools

    memory card slot

    Memory cards: Secure Digital (SD) and Compact Flash (CF) cards are an essential part of the digital imaging process, as they record and store the precious images taken. Memory cards can provide good services over a long time, as long as basic handling guidelines are respected. This overview and list of frequently asked questions provides suggestions on how to get the most of one's cards.

    Series filters: Series filters are glass or gelatine disks mounted in a threadless metal rim. The latter are attached to the lens with the help of an adapter and a retaining ring. Series filters were widely used from the 1930s to the 1970s, but since then have largely been replaced by the E-system of threaded filters. This article provides an overview of these legacy accessories.

    EXIF data viewer: Image metadata contains a rich set of information on the image and how it was captured. This online tool reveals all the hidden EXIF tags on shooting, timing and location settings. Just upload the image that you want to inspect and you will promptly see all the hidden infos revealed.

    Photography glossary: Digital photography is developing rapidly and new features are often accompanied by new terminology. The resulting plethora of acronyms, designations, and phrases can at times be daunting and even off-putting. This list of definitions cuts through the jargon and explains many imaging terms in detail. Check it out!

    Elsewhere on the web, there are nowadays many excellent photo gear websites available. Here are five favorites: For the latest product releases and industry updates, Michael Zhang at maintains a very comprehensive news blog. For in-depth technical assessments of photography gear, Scott Everett and his team at provide unparalleled scope and rigor, and maintain a lively discussion forum. For hands-on camera and lens evaluations, Gordon Laing at offers critical yet constructive reviews, and for explanations on the technical foundations of digital photography, Sean McHugh at makes many pertinent resources and illustrated tutorials available. Last but not least, Heinz Richter's gmpphoto blog is a great source of information on the history of Leica and its cameras.

    It is remarkable how far imaging technology has advanced since the Ur-Leica of 100 years ago, isn't it?

    The Ur-Leica - the first 35mm camera