Canon recalls some EOS 650D models over grip allergies
Zinc bis production can irritate photographers in more ways than one
Canon has warned that a manufacturing defect on its EOS 650D digital SLR camera can lead to bleaching of the rubber grip and, in some circumstances, skin reactions in its users including rashes.
The problem, Canon has explained, is the result of the use of too much rubber accelerator - used to cure the left and right rubber grips after application. This accelerator, when exposed to high temperatures or humidity - exactly the sort of thing you get in a photographer's sweaty palms - can result in N,N’-dimethyldithiocarbamate, more commonly known as 'zinc bis,' being deposited on the rubber surface as the result of a chemical reaction.
"The amount of zinc bis detected during our testing was minimal", Canon has explained in a statement to customers. "It is possible for zinc bis, in the small amount found in the camera grips, to cause allergic reactions, such as a rash, when it comes in contact with skin of sensitive persons. In addition, if eyes are rubbed after contact with the substance, symptoms such as red eyes may develop. As a precautionary measure, thoroughly wash your hands with water if they have come in contact with a rubber grip that has turned white. If any medical symptoms develop, please consult your physician immediately."
The issue, which may affect cameras that have yet to begin to turn white, is limited to a selected production batch of EOS 650D digital SLR cameras, sold in other markets as the EOS Kiss X6i or EOS REBEL T4i. Those units manufactured between the 31st of May and the 27th of June 2012 are affected, with Canon providing a site for checking serial numbers for return and repair. All affected cameras will be repaired for free, Canon has confirmed.