Xinca Posted November 29, 2005 Share Posted November 29, 2005 Just got a EF 70-200/F4 from a member here But I found a problem: If I shake the lens I can feel the front elements is moving. I try serval other EF lens I own and I can not find the same problem. I think the front elements should be securing. If it is a problem I will ask a refund right. So please let me know. Tks a lot! Link to comment Share on other sites More sharing options...
steve_munoz Posted November 29, 2005 Share Posted November 29, 2005 Well I just bought a used 70-200 4L about 4 weeks ago, and nothing rattles or shakes around. Its solid as a rock. I dont know whats wrong with that, or whats moving, but unless you find an explanation for it that considers that normal, then I would most definetly get a refund. I just pulled my lens out and gave it a good shake, an no noise or movement inside. My guess is something is wrong with it. Please wait for feedback with someone that may know more than me. Link to comment Share on other sites More sharing options...
mark u Posted November 29, 2005 Share Posted November 29, 2005 You should negotiate (calmly) with the seller. Don't ask us to arbitrate when we can't handle the lens to verify its condition and work out how it got to be so. Link to comment Share on other sites More sharing options...
John Crowe Posted November 29, 2005 Share Posted November 29, 2005 Is there a loose filter on the front by any chance? Have you tried taking some pictures yet to see if it is focusing properly? Of course this will be easier to check if you have a DSLR. Link to comment Share on other sites More sharing options...
Xinca Posted November 29, 2005 Author Share Posted November 29, 2005 I am sure it is the front elements. I post this question here is just because I am not a super experience used lens guy. I used to have a used 28-135 IS. That one even worse but it works realy well. I just want to know whether it is a problem or it is normal for a used lens. Tks for the reply. Link to comment Share on other sites More sharing options...
awindsor Posted November 29, 2005 Share Posted November 29, 2005 Guess Puppy Face could finally dump that lemon ...... Legal Disclaimer: The above opinion does not necessarily reflect that of General Electric or the Ford Motor Company. Most especially the above opinion does not reflect that of the poster who has only the highest respect for Peter Kun Frary. Link to comment Share on other sites More sharing options...
PuppyDigs Posted November 30, 2005 Share Posted November 30, 2005 All the EF 70-200 4L USM lenses I've handled emit a slight rattle when shook violently. A large element directly behind the front element moves to achieve focus and therefore is on a moveable track. It can't be too tight or you'd need a huge motor to drive it. In fact, most zooms rattle a little when shook violently. Keep on shaking it and you'll probably knock that element out of alignment and everything will be blurry on one side... If you do a search you'd find this topic has come up a few times for this very lens in the past. Sometimes the light’s all shining on me. Other times I can barely see. - Robert Hunter Link to comment Share on other sites More sharing options...
pjmeade Posted November 30, 2005 Share Posted November 30, 2005 My lens is only about 6 months old and I can detect some feeling of movement. Alarming perhaps, but the lens is otherwise perfect. Go out and shoot a few hundred photos and see whether there is any sign of a problem. Always being aware of back focus problems, of course. Link to comment Share on other sites More sharing options...
isaac sibson Posted November 30, 2005 Share Posted November 30, 2005 Mine has had exactly the same sound from when I bought it in 2001. It's fine. Link to comment Share on other sites More sharing options...
danny lee Posted November 30, 2005 Share Posted November 30, 2005 Just shook mine, yep, it moves, you fine. Link to comment Share on other sites More sharing options...
jon_austin Posted November 30, 2005 Share Posted November 30, 2005 Why on earth would anyone shake a lens violently (or at all, for that matter)? Talk about asking for trouble ... Link to comment Share on other sites More sharing options...
bobatkins Posted November 30, 2005 Share Posted November 30, 2005 The very finest optics, such as are found in the objective lenses of diffraction limited telescopes, are held loosly in their mounts. If they were held tightly, they would distort enough to degrade the image. I'm not saying that elements hould rattle around or that it should should be the case with all lenses, but I am saying that if you really crank down on the rings that hold lenses in their mounts, they will distort. For the finest astronomical optics, you'll see the difference. Whether you'd see the difference with photographic optics and limited resolution film or sensors, I don't know. Link to comment Share on other sites More sharing options...
Xinca Posted November 30, 2005 Author Share Posted November 30, 2005 Tks for all the reply. I will do some test this weekend and let the photo make the decision. Thank you guys very much! Link to comment Share on other sites More sharing options...
lotsawa Posted December 1, 2005 Share Posted December 1, 2005 > All the EF 70-200 4L USM lenses I've handled emit a slight rattle when shook violently. You'd better try this one instead. Cheers!<div></div> Link to comment Share on other sites More sharing options...
danny lee Posted December 3, 2005 Share Posted December 3, 2005 perfume ? Link to comment Share on other sites More sharing options...
Xinca Posted December 5, 2005 Author Share Posted December 5, 2005 Tks for every one. Test result make me feel better now. Damn 70-200/F4. 200 side is really soft. others is beautiful! Link to comment Share on other sites More sharing options...
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