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<blockquote data-quote="Marcel" data-source="post: 266237" data-attributes="member: 3903">When I bought a 17-55 2.8 Nikon DX lens, I knew it had been dropped and the zoom was stiff. Well, it didn't take too long before it got stuck and it cost me 425 $ to get it fixed. These lenses have a double helicoidal zoom ring. Meaning that when you start at 24 and zoom in, the front portion of the lens will go in, and then passed a certain point, it'll start going out again. You can see the physical length of the lens go smaller and then bigger. This is what makes it tricky to repair in my opinion.Now I bought a pre-owned 24-70, and did manage to drop it and it's still functioning&nbsp; very well and the zoom is all OK. Only the filter part of the lens cracked when it landed on my hardwood floor. So there is a crack and the filter is a bit tricky to get&nbsp; on and off but I keep it there to prevent the crack from getting bigger. I think my heart did stop for a second or two when that happened.</blockquote>

[QUOTE="Marcel, post: 266237, member: 3903"] When I bought a 17-55 2.8 Nikon DX lens, I knew it had been dropped and the zoom was stiff. Well, it didn't take too long before it got stuck and it cost me 425 $ to get it fixed. These lenses have a double helicoidal zoom ring. Meaning that when you start at 24 and zoom in, the front portion of the lens will go in, and then passed a certain point, it'll start going out again. You can see the physical length of the lens go smaller and then bigger. This is what makes it tricky to repair in my opinion. Now I bought a pre-owned 24-70, and did manage to drop it and it's still functioning very well and the zoom is all OK. Only the filter part of the lens cracked when it landed on my hardwood floor. So there is a crack and the filter is a bit tricky to get on and off but I keep it there to prevent the crack from getting bigger. I think my heart did stop for a second or two when that happened. [/QUOTE]

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