Sigma 28-135mm f3.8-5.6 Aspherical IF Macro is one of several lenses introduced at PMA 2000 by Sigma Corporation. Incorporating aspherical optics, plus a floating inner focusing system, this lens minimizes spherical aberration and stigmatism. This lens can focus from infinity to 19.7 inches at all of the focal lengths without close-up accessory, and as close as 9.4 inches (1:2 reproduction ratio) at the 135mm zoom position. This lens incorporates an inner focusing system and features a non-rotating front lens barrel for convenient filter use. A custom designed "Perfect Hood" with bayonet mount is provided to prevent extraneous light from degrading the image quality.
|Construction||12 Groups / 13 Elements|
|Angle of view||75.4°-18.2°|
|F stop range||22-32|
|Closest Focusing Distance||50 macro (24)cm / 19.7 macro (9.4)"|
|Dimensions (Length x Diameter)||75 x 75mm / 2.9 x 2.9"
Full Extended Length 119.5mm / 4.7"
|Weight||410g / 14.5"|