![]() (Note though, that I didn't say low light and critical shooting.) To all appearances, Sigma succeeded in their goals for it, as the lens conveys a sense of quality and solid construction. This isn't meant to be a throwaway cheapie like the plastic fantastic 50mm lenses found at the bottom of most camera company's lines, but rather a high-quality, fast lens suited for critical shooting or low light photography. All that being a long way of saying "normal". On cameras with a 1.6x crop factor (the lower end of Canon's DSLR line) it translates to a 35mm equivalent focal length of 48mm, on a 1.5x camera (Nikon, Pentax, and Sony models) it's the equivalent of a 45mm optic, and on a 4/3 camera (Olympus and Panasonic), it has the same field of view as a 60mm lens on a 35mm film camera. This is a high-quality lens (hence the "EX" in Sigma's designation) meant to provide a "normal" field of view on a sub-frame camera. It's just this consideration that prompted Sigma to develop the 30mm f/1.4 EX DC HSM lens that's the subject of this test report. With the mass move to sub-frame digital SLRs, a "normal" lens should now be something closer to 30mm, so there's a need for fast (large aperture), high-quality 30mm lenses to fill the same role as did the 50mm optics of yore. Actually though, the true definition of "normal" holds that the focal length should equal the length of the frame's diagonal, which would put "normal" at something closer to 43mm. *This product is developed, manufactured and sold under the license agreement with Nikon Corporation.In the 35mm film world, a "normal" focal length (that is, one which is neither wide angle nor telephoto) has always been considered to be 50mm. ![]() * L-Mount is a registered trademark of Leica Camera AG. ![]() * This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation. It is not featured on Sony E mount, Canon EF-M mount, and Micro Four Thirds mount. * Only L-Mount and X Mount features mount with dust and splash resistant structure. The degree to which light is refracted by glass depends on the light's waveleng… ![]() The polygonal shape of a conventional iris dia phragm causes out-of-focus light… The lens mount incorporates rubber sealing to protect the mount from dust and w…
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