• Designed for use with full frame digital SLR cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 150mm with most cameras
• Focuses down to 1:1 magnification ratio at its closest working distance of 12.3 inches
• Extremely compact weighing only 16 ounces & measures only 3.8 inches long.
• A lens hood, front & rear lens caps and carrying case are included with the lens.

The Sigma 105mm f/2.8 EX DG macro lens delivers superb, distortion-free images throughout its broad focus range, from infinity telephoto to lifesize (1:1) macro, as close as 12.2″ without accessories. Its non-rotating front lens group makes it easier to work with polarizing filters. A focus limiter helps divide the broad focus range into more manageable chunks.

The “focus-free” mechanical design allows the lens to autofocus without any interference from the manual focus ring, making it easy to hold the lens without affecting the speed or normal operation of the autofocus function. Rugged mechanical construction also makes it durable enough for even the heaviest use required by professional photographers. An ideal lens for a wide variety of applications from nature photography to portraiture.

The improved DG lens design for this lens corrects for various aberrations. This macro lens is specially coated to get the best color balance whilst cutting down on ghosting caused by reflections from the digital image sensor. The lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras.

Reviews

Sigma 105mm f/2.8 EX DG Macro Interchangeable Lens Review by ephotozine.com

The positive points of the Sigma EX 105mm f/2.8 Macro DG are:

• Very good optical performance throughout the aperture range
• Edges as good as centre. (on APS-C sensor)
• Contrast and aberration control improved from older model
• Value for money

The negative points are:

• AF still not lightning.
• Lens cap not useable with hood. (minor niggle)

Sigma 105mm f/2.8 EX DG Macro Lens Review by the-digital-picture.com

The Sigma 105mm f/2.8 EX DG Macro Lens is a really sharp and well-built lens for the price – a good value.