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Re: 70-300 IS USM recall and return

Mars C , Oct 14, 2006; 03:24 a.m.

Mine belongs to the early production unit with "0" in the 3rd digit of the serial number. It is supposed to have the portrait problem, and I could see there is very little loss of resolution in potrait mode at 300mm, viewed at 100%.

To those people who own this lens, My questions are,

1. Did you notice an improvement in resolution at 300mm portrait mode, after it was serviced?

2. Did the problem returned after a couple of month of use after it was serviced?

3. Was the zoom creep fixed and then returned after a couple of months use, after it was returned?

4. Does anyone here on the same situation but never bothered to return the lens, and after months of use the lens sharpness at 300mm portrait mode worsened or stayed the same, compared to when it was new?

I'm asking this because, If after months of use prior to the fix, and the barrel loosens up again, the small problem might return . so it might not be worth it, to send the lens after all. Thats what I like to know.

Thank you for your time.


Michel Latendresse , Oct 14, 2006; 06:19 a.m.

I have that lens but mine was a post recall serial number so I didn't have the problem. My understanding though is that Canon didn't bother with fixing the problem but instead replaced the lens with a new one (but I could have been missinformed)

Loren Cain , Oct 14, 2006; 07:33 a.m.

I never noticed the problem with my copy before sending it in, but I sent it in anyway, thinking that if I ever decide to sell it, the buyer would want to know if the fix had been applied. Since I didn't see the problem to begin with, the only difference I really see now is that the barrel is tighter (but it's only been a week since the lens was returned to me).

For what it's worth, Canon returned the lens to me in under a week. I'd go ahead and send it in while you can.

pierre bize , Oct 14, 2006; 08:22 a.m.

I returned mine in may this year as it had the problem and it was quite bad. I had to wait 5 months (!) to get it back... Now the problem with image quality is fixed but the AF/MF selector remains stuck on the MF position, even though the AF still works correctly, but the problem is I just can't change the focussing mode to MF... This is very weird and I am p...ed off.

Sitthivet Santikarn , Oct 14, 2006; 11:43 a.m.

I had the portrait problem which was fixed by Canon. The lens creep was gone also, which was an added bonus.

pierre bize , Oct 14, 2006; 11:45 a.m.

By the way mine seems to still creep...

dr evil , Oct 14, 2006; 11:53 a.m.

Hi Im in the same situation and haven't returned the lens. I can't see a problem with it on my 20D but Im assuming that you can only detect the problem with the lens on a full-frame body? Even so, I can't be arsed returning it. Im unlikely to sell the lens either.

Bob Atkins , Oct 14, 2006; 01:36 p.m.

If you don't have a problem the main reason to return it for fixing would be so you could sell it at some point. If you have an early lens that hasn't been "fixed" no knowledable buyer will want it.

I'd never notice the problem with mone, but I had it "fixed" anyway.

The "fix" also gives you an extra 6 months warranty on the problem from the date of repair.

nam nguyen , Oct 15, 2006; 01:04 a.m.

I got mine fixed. Though no extensive testing, upper edge resolution for portrait orientation is better. No more zoom creep. And things have been staying that way for a few months now.

David Hay , Oct 15, 2006; 11:53 a.m.

I have one of the first of these lenses. I hadn't noticed the portrait problem until someone reported it on the Net, checked mine on a lens target, and it was obviously there as a loss of detail at the top and bottom of the frame at 300mm f5.6, and to a lesser extent at f8.

Early repair attempts reported on the Net seemed to involve just trying to tighten up the lens, which might mean the problem could re-appear later.

When Canon reported a permanent fix for the problem I sent mine in for repair. I believe the fix involves the replacement of the entire optical assembly (including image stabiliser). My lens now feels completely different, with a firmer zoom action, no lens creep, and no play at the end of the lens at 300mm.

I would recommend getting your lens fixed.

David Hay

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