Hello again everyone! I just posted a question a few days ago and with the help of the nice people here in this forum, I have solved my problem. Thanks again. Now, I have another question about Canon lens 70-200mm f/2.8. I've been thinking and saving some money in order of to get this lens in the future. However, I still have a few doubts about it. First of all, I never really hold this lens personally and I have no idea how big and especially how heavy it is. For a woman, 160 cm - 53 kg, do you think it will be a lens too heavy to carry around. I have EOS 7D and the lens I use most of the time is 24-105mm plus the 50mm f/1.4. I mostly take photographs of people (specially children expressions) and sometime landscape as well. Although those 2 lens do quite a good job and I have had many good photos using them, I'd like to be able to take the photos in a more candid way and not having to come to close to the subject. Plus with the aperture of F/2.8 on 70-200, I think I will be able to throw away the background even more. Do you agree that the 70-200 will serve me better in this sense. Or is there any other lens that I can use with that purpose in mind, other than the 70-200mm? I prefer lenses with big aperture. Second doubt is about which version of 70-200 lens I should get. Whether the old 70-200 f/2.8 without IS or 70-200 f/2.8 IS I USM or even the lattest II version? What is the fundamental differences between the I version and the II version beside the price? Is it really worth and justify the price to get the latest version? Looking forward to have all the useful advices and to clear up my doubts about this lens. Thank you all in advance!