The Leica APO-Summicron-SL 50mm f/2 ASPH. Lens is widely talked about as a pinnacle lens for full frame cameras. Can it really hold the crown?
Coming to you from Christopher Frost, this detailed video provides a straightforward look at the Leica APO-Summicron-SL 50mm f/2 ASPH. lens, specifically examining build quality, handling, and image performance. Frost highlights that the lens is built with Leica’s characteristic attention to detail: solidly metal, weather-sealed, and ergonomically simple. He notes the absence of an aperture ring, something Leica deliberately chose to exclude from this lens, aligning with their newer camera designs. One potential concern he raises is the stiffness of the manual focus ring in his testing sample, something to keep in mind if you rely heavily on manual adjustments. Frost also mentions noticeable focus breathing and slight noise from the autofocus motor—both factors might influence your decision if you shoot video frequently.
Image quality is where this lens truly sets itself apart. Frost tests sharpness at both standard (24 MP) and higher (60 MP) resolutions, finding that the lens consistently delivers superb sharpness from center to edge. Even at the wide-open aperture of f/2, sharpness and contrast remain excellent without noticeable color fringing. He provides clear visual examples of this performance, demonstrating how the lens manages to deliver professional-grade results regardless of your camera's resolution. The 50mm maintains its exceptional sharpness until diffraction slightly softens images at around f/16. Frost also runs tests on distortion and vignetting, noting minimal distortion but a noticeable vignette at f/2, which disappears by f/2.8.
Key Specs
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Focal Length: 50mm
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Aperture Range: f/2 to f/22
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Lens Mount: L Mount
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Format Coverage: Full Frame
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Angle of View: 47.2°
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Minimum Focus Distance: 35 cm (1.15 ft)
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Magnification: 0.2x
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Autofocus: Yes
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Image Stabilization: No
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Filter Size: 67 mm
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Dimensions: ø 73 mm x 102 mm
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Weight: 740 g (1.63 lb)
Where the lens slightly falters is its handling of flaring and glare, which Frost identifies as merely average—unexpected for Leica’s typically meticulous optical standards. Additionally, the close-focusing ability is notably strong, outperforming many competitors at this focal length, though a minor touch of purple fringing appears at the widest aperture. However, this disappears at f/2.8, showcasing the overall excellent optical correction of the lens. The APO designation (apochromatic design) effectively minimizes chromatic aberration, resulting in exceptionally clean images even in challenging lighting conditions. Bokeh performance is another highlight; Frost shows how the lens delivers pleasingly soft, out-of-focus backgrounds without harshness.
Considering this lens's performance, it's evident why it commands a premium price. While clearly targeted at serious enthusiasts and professionals, understanding its minor shortcomings and significant strengths is vital to determining if it’s worth the investment for your particular style or needs. Check out the video above for the full rundown from Frost.
