Samyang 135mm F/2 ED UMC

The Samyang 135mm f/2 ED UMC is a manual-focus telephoto prime. Its optical design covers full frame, while some mount versions serve cameras with smaller sensors. Versions include Fujifilm X, Sony A, Sony E, Canon EF, Nikon F, Pentax K, Samsung NX, Canon EF-M and Micro Four Thirds.

The fixed view suits portraits, performances and distant details. Choose the mount made for your camera and check whether the framing fits the spaces where you work. The main trade-off is manual focus, especially when subjects move towards or away from you.

Samyang introduced this design in 2015. Consider the weight of the full camera kit and the support available for a long portrait or stage session.

The Fujifilm X version weighs 1 lb 15 oz (880 g) and measures 5.84 in (148.4 mm) long and 3.23 in (82 mm) across. Other mount versions differ in weight and length. Allow room for the hood and caps when packing. Screw-in filters must match the 77mm front thread.

At 135mm, the lens selects a small part of a distant scene. How much fits depends on subject size, camera position and sensor format. An APS-C or Micro Four Thirds sensor records a tighter view than full frame from the same position. Check the borders for distractions before taking a portrait.

The f/2 maximum aperture admits more light than a smaller opening. At a given shutter speed, it can allow a lower ISO in a dim theatre or evening reception. A close subject can stand out against a soft background when there is enough space behind it.

At close portrait distances, depth of field can be shallow at f/2. Focus carefully on the important detail, then check again after the person or camera moves. Stop down when more depth is needed for the face, and inspect the resulting shutter speed.

Closest focus is 2.6 ft (80 cm), measured from the sensor. This range can help with flowers or small details. Leave room ahead of the glass for light and check that the camera does not shade the subject.

Focus is adjusted with the manual ring. Use a magnified view or other focus aid if your camera provides one. For a fixed composition, check focus before the moment arrives. Refocus when the subject changes distance; a previously sharp setting may no longer suit it.

There is no image stabilisation in the lens. A camera with body stabilisation can help with shake. Firm support helps during long exposures of still subjects, but moving people still need a suitable shutter speed. The lens has no weather sealing, so keep it sheltered from rain and blowing sand.

ED glass helps reduce chromatic aberration, where different colours focus at different points and leave fringes along high-contrast edges. Backlit portraits and stage lighting can create those edges. This design feature does not establish measured image quality.

Focusing is internal, so the barrel length stays fixed as focus changes.