The Tokina atx-i 100mm F2.8 FF MACRO is a compact medium tele macro lens for full frame format film and digital SLR cameras. Being light-weight, compact, performing high resolution, fast aperture, low distortion, low falloff and beautiful soft bokeh this lens is extremely attractive tool for macro, portraits, landscapes, street art, commercial and general purpose shooting. The optical design of Tokina atx-i 100mm F2.8 FF MACRO features zero curvature of field and extremely low distortion while maintaining super high resolution across the entire image along with low falloff and perfectly controlled chromatic aberration. Multi-coating applied to optical elements effectively control flare and ghosting. The front of the lens has a 55mm filter threads which extends during the focusing but does not rotate. This allows different filters including polarizers to be used for landscape or product photography. The direction of the manual focusing ring matches the proprietary direction of Nikon and Canon lenses. The front of the lens has a 55mm filter threads which extends during the focusing but does not rotate. This allows different filters including polarizers to be used for landscape or product photography. The Tokina atx-i 100mm F2.8 FF MACRO Nikon F mount is equipped with manual aperture ring based on ai AF Nikkor D-Type lens standard that allows to use this lens with wide variety of cameras including old Nikon film cameras. When used with Nikon DSLRs that do not have a focus motor in the camera body like D3000 and D5000 series only MF mode is available. Highly valued One-touch focus Clutch mechanism allows to switch between autofocus and manual focus easy. Specifications Focal Distance :100mm Minimum Aperture :F2.8 Maximum Aperture :F32 Format Full-Frame Coating: Multi-coating Lens Configuration: 9-8 (elements/groups) Angle of View: 24° Minimum FocusDistance: 0.3m Macro Ratio: 1:1 Focus Method: Extending barrel Diaphragm blades: 9 Filter size: 55mm Overall length: Nikon F mount: 95.2mm Canon EF mount: 97.7mm Maximum diameter: 73mm Weight: Nikon F mount: 515g Canon EF mount: 525g Hood BH-551.