Leica objektiv4/29/2023 ![]() ![]() When the profile isn’t supported, it’s possible that the distortion may be noticeable in certain images where strong linear elements are located near the borders of the image frame. These corrections or adjustments are also applied in-camera and to out-of-camera JPEGs. A built-in profile that instructs RAW files in supported processing software to make additional adjustments to handle distortion. The APO-Summicron-SL 35mm F2 ASPH has very low levels of distortion. Nevertheless, it has high central sharpness from f/2 on and it performs well in retaining sharpness at smaller apertures, where the effect of diffraction would typically be more noticeable. That puts it on par with other made-for-mirrorless lenses with a 35mm focal length… but there haven’t been that many made, and we’ve only a handful in our database. When mounted on the high- resolution L-mount 47MP Panasonic Lumix DC-S1R, the Leica APO-Summicron-SL 35mm F2 ASPH achieves an overall DXOMark rating of 39. Whereas the earlier Leica Summilux-SL 50mmm F1.4 was designed as a large, fast lens with very high image quality, the slower APO-Summicron-SL 35mm F2 ASPH is intended to be lighter and smaller, yet still optimized for superior image quality. Three aspherical elements (with two dual-aspherical).Nine anomalous partial dispersion (ED type) elements.Measuring 102mm x 73mm (4.02″ x 2.87″) and weighing 750 grams (1.59 lbs), this lens is aimed squarely at high-end amateurs and professional users. The lens is weather-sealed, and the focus ring has been especially designed to resist ingress by dust and moisture. ![]() Users can manually focus by using a ring with a unique magnetic field sensor system that allows for fast and highly precise adjustment, and which resists focus inaccuracies from temperature fluctuations. Leica says using two small actuators to independently control two focusing elements allows it to travel the entire focus throw in 250ms. Leica has used multi-coatings to reduce stray light and reflections that can result in flare and ghosting, and uses Aquadura coating on the front and rear exterior elements to repel grease and water droplets.įocusing is completely internal and features quiet and swift autofocus using what Leica call DSD (Dual Synchro Drive), a system composed of two stepping motors. As a result, the lens has a complex construction consisting of 13 elements, nine of which are anomalous partial dispersion (low-dispersion) glass to control fringing, while a further three are aspherical (two of which dual-aspherical) for monochromatic aberration correction. Leica’s APO designation means that this is one of their best, most highly-corrected models. The Leica APO-Summicron-SL 35mm F2 ASPH is a fast, moderately wide prime lens for Leica, Panasonic, and now Sigma L-mount cameras. ![]()
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