Dear all: I am about to purchase Canon's 70-200mm f/2.8 L lens but am in doubt as to which model to choose. There are basically two models, the difference being that one has IS (image stabilization) and the other doesn't. Outside of that they seem to be the same lens. Is this correct ? I have heard that the model without the IS is an older design and the focus is not as fast or responsive but I am not sure about the source of this information and how accurate this is. Are there any other distinctions between these two models that any of you would know of ? Is IS such a necessary thing as to justify a price increase of 50% ? While the IS model is selling for about $ 1,700 the model without the IS is selling for $ 1,140. Is this difference justifiable and will the IS provide such a major benefit as to compensate for the price difference ? Best regards, Joseph --- Dr. Joseph Chamberlain Oral and Maxillofacial Surgery
