Ring USM or not

Started Sep 19, 2006 | Discussions thread
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Skyspotter
Skyspotter Regular Member • Posts: 298
Ring USM or not

Hello all

i have done a search but i didnt have any luck, i have seen some second hand lens for sale with USM focusing, i have read that there two types ring type (the good one) and not ring type.
How do i tell the difference???

Thanks
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Land of the Long White cloud ( Aotearoa)

 Skyspotter's gear list:Skyspotter's gear list
Canon EOS 60D Canon EF 50mm F1.8 II Canon EF-S 15-85mm f/3.5-5.6 IS USM Canon EF 28-80mm f/3.5-5.6 II Canon EF 70-200mm F4L USM
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