I recently purchased a 5DMII and am happy with the camera but am concerned about my current lenses I am using from my previous camera. It seems in some of my shots the images are not as sharp as I would like but it may also be from user error. I currently have: EF 28-70 mm f3.5-4.5 II EF 70-210 mm f3.5-4.5 Ultrasonic I got these many years ago for my film camera (1991). I am leaving for a 10 day vacation trip out west (Glacier and Banff National Parks) in about 3 weeks and am concerned whether the lenses will be adequate. One troubling thing is my 28-70 mm lens is very hard to turn from 60 to 70 mm and will not focus properly at a distance (image is blurry) at this range (60-70mm). When on manual sometimes the focus wheel has slight resistance at points when turning. The 70-210 mm lens works well. Is there a danger of my 28-70 mm lens failing on the trip? I was looking at replacement possibilities and I would want get a high quality lens that will last long time. However my budget is rather tight now that I just got a new 5DMII and would have to heavily borrow to get a new lens. I was looking at the EF 24-70mm f2.8L USM and EF 35mm f1.4LUSM lenses on Cannon’s website. In addition to the cost my concerns are that I heard that some of the 24-70mm lenses are not calibrated correctly and need to be returned, and are also heavy. This is a concern, since if I get it I would need a good, working lens in less than 3 weeks and I will be hiking at a high altitude where weight may be an issue. The 35mm will limit me in focal length. I am leaning towards keeping what I have for now but am thinking that with better lenses I will have much better pictures (which is why I got the 5DMII). Any suggestions?