There are a few videos on youtube showing how to refocus the lens but most out of focus Disco's had been crashed. You just might have got one not focused right from the factory.
A lot of (all?) Discos have this issue in the cold. Some people have put some insulation so that the camera's own heat keeps it warm. The alternative is to unglue and refocus, but you'll likely have to redo it the other way when flying in the summer.
Thanks Kilrah, so basically you are telling me that I need to buy 2 1 for the summer and 1 for the winter lol
Thanks Agustine, I shall scour youtube for some videos and amazon for any tools I need
Nidge,
You are a little more hardcore than perhaps the level I am currently at lol!