Tweedehands Sigma 105mm F/2.8 D Ex Macro Nikon Sn.:cm0489

Sigma 105mm f2.8D EX Macro

Versatile 1:1 macro lens - it can be used on the full range of legacy film and modern digital bodies. There are two nearly identical (externally) versions: the EX-DG, and the earlier EX. These are optically distinct, see specs., the DG was a revision of the EX for digital, with attention to eg sensor reflection. This lens uses a 2-step combination of a push/pull clutch and an AF/MF switch to select the desired focus mode - this is what Sigma calls their DF (Dual Focus) System. The focus ring is pushed forward or pulled backward to disengage/engage the manual focus mechanism. In the forward AF position, the focus ring turns freely but does nothing and AF does not cause the ring to turn. In the rear MF position, the manual focus mechanism is engaged. Because the focus ring moves in relation to the markings, 2 sets of macro markings are needed. The white are for use during AF and the yellow are for use during MF. Lens has a focus limiter switch to reduce hunting, restricts to cfd 0.4m/1.3' (1:2). Flick to full for 1:1.

• Weight: 457g/16.1 oz.
• Length: 97.5mm/3.8 in.
• Filter Diameter: 58mm, screw thread only for hood/filter.
• Min. Focus: 31.3cm/12.3 in.
• Minimum working distance (ie from lens end): 12.2cm/4.8 in
• IF - lens extends but front group does not rotate.
• Focus throw (manual focus): ~270deg
• Max. Magnification: 1:1
• Horizontal FOV: 23.3 degrees
• Horizontal FOV on Digital: 15.5 degrees
• Aperture range f2.8 - f32.
• Effective max aperture: f/4.2 at a 1:2; f/5.5 at 1:1
• Iris: 8 blades
• Optical Construction: 11 Elements in 10 Groups (EX-DG), 10 elements in 9 groups (EX).