The Olympus Zuiko 21-millimeter f/3.5 is an ultra-wide-angle lens that is well-suited for architectural, landscape, and close-up photography. Perfect for the professional, yet flexible to meet the needs of the novice, it exceeds the expectations of both. A wider aperture setting surpasses its f/2 predecessor, giving your camera greater exposure and focus abilities to get that perfect shot. With an angular field of 92 degrees, the Zuiko 21-millimeter f/3.5 lens captures the maximum width of the subject while also allowing impressive photography. It has the ability to take up-close photos with great detail and color. The aperture, also known as the f-stop of a lens, is a ratio of the focal length of the lens to the diameter of the opening. Olympus has engineered their aperture technology to create an enhanced experience of diaphragm capability and innovation. A dedicated filter improves photographers' control while working with the lens. It’s compact and delivers sharpness at wide angles even when taking a macro shot with compatible cameras. In a macro situation where there is weak lighting or when using a filter, the f/2 based lens performs very well. The compactness and light weight of the Zuiko 21-millimeter lens make it a prime choice for hiking or traveling, and the metallic housing helps to protect it while in use. Co-developed with Panasonic, Olympus lenses were one of the first in the industry to use mirrorless interchangeability. The f/3's focal length and aperture diameter deliver great contrast and provide less image distortion. Taking successive rapid shots at wide angles makes it ideal for doing point-and-shoot from a distance. You're manual focus-ready on a sunny day using the Zuiko 21-millimeter f/16 for a large depth of field setting. It offers full autonomy to control and adjust the range or instantly flip back to autofocus. For a 35-millimeter SLR full-frame exposure shot, it is just as functional. If you're using a sigma mount for a camera other than Olympus or Panasonic, you can still expect flawless pictures. When you think of speed, keep in mind that the more rapid the shutter is, the faster the main lenses can capture images in low light. High-speed, wide angle shots are the pinnacle of f/2 performance. At the f/2 setting, the Zuiko 21-millimeter does not sacrifice weight for performance. Instead, it acts in a capacity normally reserved for a larger, heavier lens-mount. The Olympus Zuiko 21-millimeter f/3.5 has a 12-millimeter to 60-millimeter scope range that helps your digital camera get the perfect photo even when the target is in motion. This durable product repels dust and moisture, reducing mildew and mold that can damage your lens.