Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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Canon EFS17-85 mm Image Stabilizer Lens stuck in Macro mode.

After 5 years of Faithful service my EFS 17-85mm Lens has suddenly block in the full Macro position. The Macro ring turns with no effect. Anyone know how to fix this?

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The USM focus works by applying pressure to a set of rollers. That pressure is achieved with a large diameter spring washer. It is held in place by another large diameter flat washer that on assembly is rotated 60 degrees to lock it in place. If the lock washer has moved due to mechanical movement (ie rapid manual movement of the focus ring) it could unlock and then all pressure to the USM motor parts and rollers is lost giving the loose feel you mentioned.

You will need to dissassemble the rear of the lens to see the USM motor parts, rollers and locking ring to reattach it. Follow the links at my pbase gallery to see the dissasembly. When I took my lens apart the focus and USM motor went all loose and I wondered how could it work ever!!!. The locking ring was off which sounds just like your fault. http://www.pbase.com/barry_2718/efs1785mm I also have a flex cable cracked which is a much harder fix. Take careful note of the parts (mark then with a felt marking carefully) to achieve a reassembly exactly as removed.

Posted on Jun 24, 2010

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