Question about Canon AF EF 100-300mm f/4.5-5.6 USM Lens

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Barrel slides I have recently obtained a secondhand Canon EF 100-300mm f/4.5-5.6 USM lens.It is in beautiful condition and the autofocus and manual zoom work fine. Pictures also are fine. The one operational flaw is that when pointed downward the lens barrel will slide out from 100mm position to near the 200mm position with little resistance. Conversely, if set at just lower than 200mm and pointed upward it quickly! slides in to 100mm position. Is this problem something that you are familiar with and if so, what is your recommendation, considering difficulty and expense, to correct? Regards, David.

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  • DAMERK Apr 29, 2008

    Thanks for the suggestion, I will try the rubber band fix. I am thinking that the band will sit on the front edge of the outer barrel and overhand just enough to ride on the inner barrel as it moves to create drag. If that is not right, please correct me.



1 Answer

A fat rubber band tight enough to stop the barrel movement, but not so tight it restricts manual zooming is the best, extremely effective, low-tech fix for this problem - I have done it for years

Posted on Apr 28, 2008


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