Leica 90mm f/2 APO-Summicron-R ASPH. ROM R-Mount Lens {E60} 11350

Leica's 90mm APO portrait lens built for R-mount glass enthusiasts

The APO-Summicron-R 90mm f/2 ASPH. combines apochromatic correction with an aspherical element, two design choices that together address the chromatic fringing and spherical aberration that plague lesser portrait and medium-telephoto lenses. Apochromatic correction means all three primary wavelengths of light converge at the same focal plane, which translates to edge definition and microcontrast that holds up under close inspection of fine textures: hair, fabric, skin. The f/2 maximum aperture gives enough subject separation at 90mm to isolate a face from a background without going so shallow that focus becomes a coin flip.

The ROM chip is more than a convenience feature. It passes lens data directly to compatible Leica R-body electronics, enabling accurate EXIF recording and metering optimization without manual input. The 60mm filter thread is a practical size that stays compatible with a standard filter kit. At 90mm on the R system, this focal length sits squarely in the traditional portrait range while doubling comfortably as a tight street lens or close-focus detail shooter. Leica R glass has a long history with adapters on modern mirrorless systems, and this lens benefits from that ecosystem, adapters for Sony E, Leica M, and others are well-established, making the optical formula accessible beyond the original R bodies it was built for.

Who It's For

Photographers shooting portraits on Leica R bodies get the full package here: apochromatic correction for neutral color rendering at wide apertures, f/2 speed for available-light work, and ROM communication for metering accuracy. Documentary and editorial shooters who want a 90mm that renders without clinical sterility will find the ASPH element earns its place. Mirrorless adapters users, particularly those on Sony full-frame bodies, have long targeted R-mount APO glass specifically for this lens's rendering at f/2. Collectors and working photographers drawn to Leica optical standards will recognize what the APO-Summicron designation means in practice.

Key Features

• APO apochromatic design eliminates chromatic aberration across the frame
• Aspherical element corrects spherical aberration for edge-to-edge sharpness
• ROM chip enables automatic EXIF recording and metering optimization
• f/2 maximum aperture provides controlled subject separation at 90mm
• E60 filter thread compatible with standard professional filter kits
• 90mm focal length serves portrait, street, and detail photography equally
• Leica R-mount with established adapter ecosystem to mirrorless systems

FAQ

What does APO correction actually do for portrait work?

Apochromatic design brings all three primary light wavelengths to the same focal plane, eliminating the color fringing that causes edge blur on fine details like eyelashes or hair strands. On a 90mm portrait lens, this means skin texture and background separation stay crisp without post-processing correction.

How does the ROM chip change how this lens performs?

ROM passes optical and aperture data directly to compatible R-body electronics, so metering and EXIF data record accurately without manual input. It's not essential for basic shooting, but it streamlines the workflow on film bodies that support it.

Can I use this lens on mirrorless cameras?

Yes. R-mount to Sony E, Leica M, and other mirrorless mounts have solid third-party adapter options. The optical formula doesn't change, though you lose ROM functionality on bodies that don't support R-mount natively.

Is f/2 wide enough for portrait subject isolation at 90mm?

f/2 at 90mm gives you roughly 1.8 stops of subject separation, which is enough to separate a face from background without requiring extreme aperture settings. You won't get razor-thin focus planes, but that's often an advantage for maintaining detail in the face.

What's the practical difference between this and a non-APO 90mm portrait lens?

Non-APO designs show measurable chromatic aberration on fine textures and edge contrast, especially when stopped down slightly. APO correction keeps edge definition consistent across the frame and aperture range, which matters if you're examining prints or pixel-peeping on screen.

Why E60 filter thread instead of the standard E55?

The larger optics required for APO correction and the aspherical element demand more glass, pushing the front element diameter up. E60 is still a common standard, compatible with most professional filter kits.

Does this lens work on digital R bodies?

Leica produced digital R bodies (R8, R9 with digital backs) that fully support ROM-enabled R-mount glass. Check your specific body's compatibility list, but modern digital R backs typically recognize ROM data without issue.