I used a "Sigma EX DG OS f/2.8 105mm Macro lens on my Canon 40D. Yes it has "OS" which is Sigma's term for "Optical Stabilization" while Canon uses "IS" for "Image Stabilization" and both reduce camera shake but NOT subject movement or shake. Higher lens speed reduces or stops subject movement or shake. Thanks for your comments.
Shaka wrote:
They are really cool pix. Did your lens have IS or not, considering it was hand held?