Quote Originally Posted by Konical
Give any frozen film plenty of time to reach room temperature before unsealing the packaging, just to avoid condensation.

That advice can't be emphasised enough. If the film is still cold when you use it it will condense water from the air and you will get a misty surface, thus giving a soft focus effect. If it is colder still, it might snap. Whenever possible I tend to take film out of the freezer the day before I use it.