ET1 Autofocus

Is it possible to fix the focus of the ET1 camera when using it to scan barcodes? In order to compete on price with a Nexus/Opticon solution , the customer has ruled out using the BlockBuster module to read codes, instead opting to use the ET1 camera. It works OK for them but they think the autofocus takes time and is a bit fussy. Is there a way to disable AF or set a focal length instead?