Hi guys: Just talked to the technician of Brighouse Repair (a Canon authorized repair shop), he thinks there is a seal in the lens not sitting at the proper position. It seems that this is possible for new lens as the seal could be installed off a bit during assembly. He recommends if the noise doesn't go away in a month or so, I could bring it in for service. I guess I'll use it for now until then.
Thank you all of you who have provided so much useful information for me. I will keep you up to date as to the progress. :) Thanks and regards, Gary ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 30, 2002 4:20 AM Subject: Re: 28-135 IS with EOS3/5 Question > Hi all, > > Gary wrote: > > > But I could occasionally hear some rubbing noise when I had moved the > > lens up and down with IS at 135mm. I don't remember I hear that with the > > other two... could it be this lens is extra new? Not sure. Any > thoughts? > > My lens sometimes does something I believe is the same as you are > describing: it makes a strange vibrating/rattling noise when I move the > lens with IS engaged. I believe this is normal. According to me this is > what happenes: > When you move the lens a little bit with IS engaged the IS-lens-element > will try to counteract your movement so that the image in the viewfinder > will remain the same. If you move even further in the same direction the > IS-element will also move futher to the side, to correct for your larger > movement. But at a certain point the IS-element has moved so far up to one > side of the lens, that it reaches its limits and hits the inner side of the > lens. At that point the IS element must jump back to the center position > (the image in your viewfinder will, of course, jump also). Keep on moving, > and a little while later the IS-element has again reached its limits and it > will then, again, jump back into the middle. This makes the > vibrating/rattling noise. Since at 135 mm smaler movements of the lens > require larger corrections of the IS-element, you are more likely to hear > this noise. > With regard to your not hearing this sound with the other two lenses: I > could imagine that there are different versions of the lens in circulation, > since Canon probably has adapted/improved the IS-lens control algorithm > over the past years. > > Just my 2 cents. Regards, > > Bart > > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
