Product details of the used Sigma 14mm f2.8 Nikon fit Lens
Primary Features. Do note that the used Sigma 14mm f2.8 Nikon EX Aspherical HSM is not a fisheye, but a true rectilinear lens. Barrel distortion is well corrected, so straight lines even at the edges of the frame are accurately rendered. Before moving on to consider optical performance in more detail however, let’s review the technical details of this lens, as follows.
· It incorporates the fast/silent Hypersonic Focusing system, described later, in models intended for Canon, Nikon (D), and Sigma autofocus SLRs. Nikon owners should note that AF operates only with the more recent cameras: F5, F100, N90 series, N70, N60, and the Pronea series. Manual focus is possible even in the AF mode. After the lens stops autofocusing, you can touch up focus by turning the ring, while maintaining slight pressure on the camera’s shutter release button.
· Models designed for Minolta and Pentax cameras incorporate a conventional focus motor. These do require you to switch to MF for any manual focus operation.
· The maximum aperture of f/2.8 is very wide, making this lens useful for photojournalism in low-light situations. I was able to get sharp pictures handheld inside Spanish missions at 1/15 sec (and even longer with my elbows braced), important because flash is not practical with such short focal lengths. That’s because very few flash units (even with accessories) can cover the 114° field of view, making such lenses more likely to be used with available light only.
· As hinted earlier, the optical formula includes aspherical–with a non-spherical surface–elements to correct aberrations. This type causes all light rays to converge on a common plane. Such elements offer several benefits: they correct linear distortion and spherical aberration (curvature of field) for more consistent edge to edge sharpness even at wide apertures; reduce halo and comatic flare; and minimize size/weight as fewer elements are required.
· In order to reduce the risk of flare (from light striking the front element) Sigma has included a built-in “notched” lens hood: cut out at the corners to prevent vignetting of the image area. In order to mount a lens cap, you do need to add an adapter ring because the cap will not fit over the bulging optics without one. This is common in other brands of super wide lenses, too. But remember to remove this circular adapter before taking any pictures. If you fail to do so, all of your photos will have severe darkening of all corners.
· Because filters cannot be mounted on the front of 14mm lenses, there is a built-in gelatin filter holder at the rear. Simply cut the right size using the “guide plate” accessory and insert the small filter in the slot provided behind the rear optical element. (Gelatin filters are available from professional photo retailers.)
· Mechanically and cosmetically, this used Sigma 14mm f2.8 Nikon is clearly a high grade lens, as suggested by the EX designation, used only for Sigma’s latest pro-caliber lenses. The barrel is made of aluminum alloy, the mount is stainless steel, and the matte-black ZEN finish offers a professional look plus scratch-resistance. You’ll find a distance scale (feet and meters) under glass as well as a depth of field scale. Models intended for some brands of cameras include an AF/MF switch and an aperture ring for setting f/stops with detents at full stops.
· The wide, rubberized manual focus ring is well damped, with plenty of friction for a familiar “feel.”
· The close-focusing ability of the used Sigma 14mm f2.8 Nikon is highly desirable for maximizing depth of field, when shooting at the smallest apertures, as discussed later.
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