Tekst z instrukcji użytkowania obiektywu, cytuję:

"If the lens is taken from a cold enviroment into a warm one, condensation may develop on the lens surface and internal parts.To prevent condensation in this case, first put the lens into an airtight plastic bag before taking it from a cold to warm enviroment.Then take out the lens after it has warmed gradually.Do the same when taking the lens from a warm enviroment into a cold one"