My beer is very clear in the bottles but fogs up when I open it

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Yes... its called chill haze. The proteins in the beer coagulate when the pressure is released. Leave the beer in the fridge for 2-3 weeks and they will precipitate out.
 
Yes... its called chill haze.

Which can be caused by not cooling the wort quickly enough after the boil and/or a few other issues.
Here is John Palmer to explain:
John Palmer said:
Symptom: The (finished) beer is hazy/cloudy.
Cause 1: Chill haze This is the number one cause of cloudy homebrew. It is caused by an insufficient cold break during cooling after the boil.
Cure: Use a wort chiller.

Cause 2: Starch If you made an all-grain beer and had incomplete conversion, or added/steeped a malt that needed to be mashed to an extract batch, then you can have residual starches in the beer that will cause cloudiness.
Cure: Watch the mash temperature and mash longer next time.

Cause 3: Yeast Yeast strains that have low flocculation, such as German Hefeweizen, will cause the beer to be cloudy.
Cure: Use a different yeast strain if you want a clearer beer.

In all cases, cloudiness can be combated by adding fining agents (e.g. isinglass, gelatin, Polyclar, bentonite) after fermentation. When all-grain brewing, the clarity can be enhanced by adding Irish Moss towards the end of the boil.
 
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