Sigma APO 70-300mm F/4-5.6 DG Macro Lens for Sony Alpha A700, A200, A100 Digital SLR 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 100 to 450mm with most cameras Minimum focusing distance of 59 inches & allows macro photography with a maximum magnification of 1 to 2 Extremely compact design weighing only 19.4 oz & measures only 4.8 inches in length In order to attain the highest quality images, the APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration.