I've had this len for just three weeks over the expiry warrant date and for some unknown reason, the zoom got stuck between 70 and 135 focal lenght and It wouldn't focus at 100,135. I turned it upright, I managed to rotate is at 28mm all the way to 135 but not when I pointed the lens at horizonatl position. I swear I didn't drop it anyway shape or form and I kept it my camera bags all the time. luckily I took it the Canon sevice centre and they would eetend the warrenty without charge. Does anyone have similar problem with this lens and any canon zoom lens. Perhaphs someone can give me tips on how to best look after this type of lens.

Thanks in advance for any reply.

Peter

-- peter li (PLI@HATCH.CA), June 18, 2001

Answers

I've had similar problems with two third party lenses but never with a Canon. The problems were both loose screws holding a cam follower. I suppose they worked loose due to vibration & age.

As far as how to take care of it; keep it away from ocean spray, dust, vibrations, and don't drop it. Cars vibrate some but usually the camera bag is padded enough to dampen it. Motorcycles & airplanes are worse though.

Unless you had this lens in a harsh situation, I suspect it had a screw that came loose due to insufficient or over tightening at the factory, or a part actually broke due to "who knows what."

-- Jim Strutz (j.strutz@gci.net), June 19, 2001.

I've owned the EF 28-135 IS USM for 3 years and have used the heck out of it and it just takes it. Zippo problems. Well, ok, it does creep a bit when pointed down. I have used Canon EOS since 1990 and have not had any mechanical failures in any of my 12 Canon lenses. In contrast, the LCD went out in my EOS 1N after only 11 months.

Puppy

-- Puppy Face (doggieface@aol.com), June 19, 2001.

I had the same problem last night. Mine was caused by tripping over a PC cord and pulling the camera w/lens attached off a table onto the floor. The innner collar ended up cockeyed. I played with it a bit and managed to free it. It seems fine but I'll have to run some tests to know for sure.

-- Paul Ferrara (paul@columbusoft.com), June 20, 2001.