Sigma 50mm f/2.8 EX DG Macro Lens for Nikon AF (Sigma 50mm f/2.8 EX DG Macro) Nikon Macro prime lens, full frame) Original Price: ~1,300 SAR Selling Price: 520 SAR Macro prime lens (Macro = very close-up photography at 1:1 life-size ratio, without any additional accessories; Prime = lens with a fixed focal length, no zoom, providing higher optical quality and wider aperture than any zoom in the same range). Discontinued Optics: •Focal Length: 50mm fixed, equivalent on DX: ~75mm •Optical Construction: 10 elements in 9 groups •Coating: Super Multi-Layer Coating (Super multi-layer coating specifically optimized for digital sensors, reduces internal reflections and chromatic aberration) •DG (Optimized for full frame FX (also works efficiently on DX cameras)) •Aperture: f/2.8 (wide aperture that lets in abundant light and provides an aesthetically pleasing soft background) ) minimum f/32 •7 diaphragm blades, Angle of View: 46.8° Macro Photography and Focusing: •Maximum Magnification Ratio: 1:1 (full life-size! The subject appears on the sensor at its natural size •Ideal for: Insects, jewelry, coins, flowers, fine engravings, without any additional conversion lens or extension tube •Minimum Focusing Distance: 0.188 m (18.8 cm) •FIF System (Floating Internal Focusing, maintains the highest optical quality from infinity to 1:1 ratio (the front element does not rotate (facilitates polarizing filters)) •AF Limiter switch (restricts the focus search range to speed up focusing and prevent hunting): Limit / Full •AF/MF switch for quick switching between autofocus and manual focus Compatibility and Specifications: •Nikon F-mount with full electronic connections •Autofocus with Screw-Drive motor (relies on the camera body's motor, fully compatible with D7100) •Warning: Autofocus does not work with Nikon D40/D40x/D60/D3000/D3100/D5000 (these cameras lack a built-in AF motor) •Manual Aperture Ring on the lens •Filter Diameter: 55mm, Dimensions: ~71 × 66 mm, Weight: ~320 grams •Included: Protective lens hood)