Samyang 20mm F1 8 ED AS UMC Análisis | 54 Datos comparados

The Samyang 20mm f/1.8 ED AS UMC is an ultra-wide manual focus prime lens offering exceptional value, featuring outstanding central sharpness, low chromatic aberration, and a fast f/1.8 aperture for low-light capabilities. The lens boasts solid construction with smooth,, precise focusing and aperture rings, along with a 20cm close-focusing distance that enhances creative shooting options. ePHOTOzine Conversely, it is a fully manual lens with no electronic connections, meaning no EXIF data is recorded, and it lacks weather sealing. While central sharpness is high, edge sharpness is lower and some corner chromatic aberration is present, while the 7-bladed diaphragm can produce a slightly busy bokeh.

The Lonely Speck review of the Rokinon 20mm f/1.8, based on testing in Joshua Tree National Park, highlights the lens as a high-value, fast-aperture option for astrophotography with excellent center sharpness and low distortion. Key pros include a smooth manual focus ring, a 77mm filter thread, and a sharp "sweet spot" at f/2.8, making it effective for capturing faint night sky details. Conversely, the lens, which is designed for DSLRs, is large, heavy, and features no electronic communication. Specific cons include strong vignetting and coma at f/1.8, along with potential for purple flaring and, due to field curvature, less-than-ideal edge performance wide open.

The SLR Lounge review of the Rokinon 20mm f/1.8 lens highlights it as an affordable, niche choice for landscape, nightscape, and vlogging enthusiasts who want a wider perspective than a standard 24mm prime without carrying a bulky ultra-wide zoom. A major pro is its exceptional sharpness from corner to corner when stopped down to f/2.8 or f/4, producing great image quality for high-resolution stills and 4K time-lapses. Additionally, it remains delightfully compact and portable, features a very smooth manual focus ring with an excellent focus throw, and accommodates traditional 77mm front filters—a rare luxury for a lens wider than 24mm. For Nikon and Pentax users, the inclusion of electronic contacts to transmit EXIF data and control the aperture directly from the camera body provides an extra operational advantage. On the downside, the reviewer points out several notable cons, beginning with a lack of edge and corner sharpness when shooting wide open between f/1.8 and f/2.5. The general build quality feels cheap due to a weaker grade of plastic compared to its direct competition, meaning users need to be gentler on...

This full-frame compatible, ultra-wide-angle manual lens offers a generous 94.8-degree angle of view and a fast f/1.8 maximum aperture, making it highly capable for shooting night skies, cramped interiors, and expansive landscapes. Optically, the lens delivers exceptional center-sharpness even when wide open at f/1.8, and it exhibits well-controlled barrel distortion (-1.28) and highly minimal color fringing at the center of the frame. Its robust build quality includes a smooth, long-travel focus ring and a separate petal-shaped hood with a 77mm filter thread. The Nikon F and Pentax K mount versions include built-in electronics to enable camera-body aperture control, PASM modes, EXIF data, and viewfinder focus assistance, ensuring highly responsive handling. However, the lens lacks autofocus functionality entirely and suffers from a complete absence of weather-sealing, which limits its durability in harsh environments. Furthermore, it acts as a "dumb lens" on all other mount options (like Canon, Sony, and Fuji), which removes all electronic communication with the camera body. For these alternative mounts, the user is forced to adjust exposure using the physical onboard control ring, which causes a frustratingly dark...

The Photodo review characterizes the Samyang 20mm f/1.8 ED AS UMC as a high-performing, manual-focus wide-angle lens, ideal for full-frame cameras and effective for interior or architectural photography. It is recognized for its solid build, reasonable price, and exceptional central sharpness, though it lacks electronic communication with the camera. The primary drawbacks include its manual-only operation and a 7-blade diaphragm that produces imperfectly round bokeh.

The Photodo review for the Samyang 20mm f/1.8 ED AS UMC details a versatile, manual-focus-only wide-angle lens available for numerous mounts, featuring a user-friendly focusing direction matched to specific camera brands. It offers outstanding central sharpness, low chromatic aberration, and well-controlled distortion, making it a well-built, fairly priced option. Key limitations include the lack of autofocus and the inherent difficulty of manual focusing with a 20mm focal length, along with a minor aperture ring quirk on the Canon-fit model.

The Samyang 20mm F1.8 ED AS UMC is a compact full-frame manual-focus ultra-wide-angle lens designed to bridge the gap between traditional wide and ultra-wide focal lengths. In testing, the lens demonstrated solid, improved build quality over previous generations, featuring a nicely fitting lens hood and a smooth focus ring with an efficient throw that allows for fast and accurate manual focusing. Weighing slightly under 500 grams and measuring 83mm x 88mm, it offers a relatively compact footprint for its class. The review highlights its versatility across diverse applications, noting that its bright F1.8 maximum aperture is ideal for low-light/night shooting and bokeh creation, while its close minimum focusing distance of 0.2 meters makes it surprisingly effective for creative macro, food, and product photography. Optically, the lens delivers impressive performance given its affordable price point, rendering accurate colours and excellent center sharpness even when shooting wide open. The review notes that flare control is decent. On the negative side, the lens suffers from slight corner softness, though the reviewer considers this a standard flaw for ultra-wide lenses and completely acceptable. Additionally,...