Reviewed By: Mf Sigma Corporation on 05/10/2007,
Customer Rating: 
The Sigma 105mm is a medium telephoto macro lens employs a new design concept for digital SLR cameras the 105mm lens power layout produces an excellent optical performance. The new 105mm Macro lens coating cuts down ghost. The 105mm DG Macro lens is designed to reduce the influence of harmful light caused by reflections from the digital image sensor. The outstanding optical performance od the 105mm Macro Sigma lens provides the ultimate correction against lateral chromatic aberration and distortion. The 105mm DG Macro lens boasts compact dimensions of f74mm (maximum diameter) and 95mm (overall length). The filter size of f58mm and, at just 450gms, is also extremely lightweight. The minimum focusing distance of 31.2cm (12.2in) is capable of macro photography with a maximum magnification of 1: 1. It is possible to enjoy photography from life-size close-up to infinity with Sigma 105mm DG Macro.
Sigma, Canon and Konica Minolta mounts have a minimum aperture of F45 for incredible depth of field (or F32 for Nikon and Pentax mounts). The 105mm DG Macro lens is equipped with a Focus Limiter Switch that limits the AF range so improving the speed and accuracy of auto focus. The Sigma 105mm DG Macro also incorporates a Dual Focus (DF) system that is designed to make the lens easy to hold during auto focusing. The large focus ring in 105mm Macro lens offers smooth and positive action whilst focusing manually. A screw-in hood is included, for convenient use of circular polarizing filters. This telephoto macro lens has an equivalent field of view of 178mm on a digital SLR camera (when used with the SD10). | 
