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Apparently there is a firmware update due in August to correct a phenomenon that can occur with the AF on the new 40mm STM lens when any pressure is applied to the lens ...
http://www.canonrumors.com/2012/08/canon-ef-40mm-f2-8-stm-product-advisory/
http://www.canonrumors.com/2012/08/canon-ef-40mm-f2-8-stm-product-advisory/
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