![]() Green background indicates lenses with image stabilization. Olympus Zuiko Digital 2x Teleconverter EC-20 Olympus Zuiko Digital 1.4x Teleconverter EC-14 Olympus Zuiko Digital ED 50-200mm F2.8-3.5 SWD Olympus Zuiko Digital ED 18-180mm F3.5-6.3 ![]() Leica D Vario-Elmar 14-50mm F3.8-5.6 ASPH Leica D Vario-Elmarit 14-50mm F2.8-3.5 ASPH Olympus Zuiko Digital 14-54mm F2.8-3.5 II Olympus Zuiko Digital ED 14-35mm f/2.0 SWD Olympus Zuiko Digital ED 12-60mm F2.8-4 SWD However, the center resolution of the lens is high when used wide open, and becomes exceedingly high when the lens is stopped down. When stopped down by over 4 stops, the edges of the frame are still soft. This lens has little response to such an effort. This problem is typically solved by stopping down the lens. Most lenses are typically sharp in the center of the image frame, and softer in the edges. The optical resolution properties of this lens are also unique. To reduce vignetting by about one half, it is required to stop down the aperture by over 3 full f-stops. This lens has a more linear response to stopping down the aperture. With most photographic lenses, vignetting is drastically reduced by stopping down the aperture by about 1 f-stop. The Sigma 30mm f/1.4 EX DC HSM lens has unusual optical properties. ( May 2010) ( Learn how and when to remove this template message) ![]() Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. On the Four-Thirds mount, it is the only affordable normal, large aperture lens, therefore it is popular lens on that format. On APS-C sensor cameras, its field of view equivalent to that of a 46mm lens (Nikon DX, Pentax, Sony, current Sigma bodies), 48mm lens (Canon), 51mm lens (older Sigma bodies) or 60mm lens (Four Thirds). Its large aperture allows for a shallow depth of field, allowing good isolation of close subjects. In 2013, Sigma announced that the lens would be replaced by a redesigned model designated as the Sigma 30mm f/1.4 DC HSM A the new lens went on sale in March of that year in Canon, Nikon, and Sigma mounts. The lens assumes a crop factor of roughly 1.5, and therefore is not usable with on full-frame or 135 film cameras. It shipped with a removable petal-type lens hood (62mm diameter). The lens was produced in Canon EF mount, Four Thirds System, Nikon F-mount, Pentax K mount, the SA mount, and the Sony/Minolta AF Mount varieties, all of the same optical formula. The Sigma 30mm f/1.4 EX DC HSM is a wide-aperture photographic lens made by the Sigma Corporation, equipped with a Hyper Sonic Motor (abbreviated HSM, Sigma's trade name for photo lens focusing technology using ultrasonic motor). Sigma 30mm f/1.4 EX DC HSM mounted on a Canon EOS 40D, hood attached. Yes (not available with Pentax and Sony mount) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This article possibly contains original research.
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