With all due respect, the above is basic good practice in terms of looking after equipment.
Indeed, I meant, not expose the lens to any transition from cold to warm at all, which will mean leave the lens in a car outside or even outside. It is what I had to do last night since I do not have with me any air tight zip bag large enough for the Otus, I'll have to try that next time.
For what it is worth, the transition yesterday was far from being abrupt and one that other lenses and the D800/my previous Nikon bodies/lenses have never had any problem with.
I have been aware of the potential dangers of condensation for years and take reasonnable measures to prevent it, but do more than what I do does IMHO fall in the realm of lens baby sitting. Those using cameras with lesser ruggedness that Nikon bodies may have developped that discipline already, I am not sure I want to add this additional burden.
Yes, I love a lot of things about the Otus, but the Zeiss 50mm f2 is also very good although it is not as amazingly well corrected. It may be a better trade off for cold shooting.
It doesn't mean I am returning the Otus, don't get me wrong. Each piece of equipment has strengths and weaknesses, the game is to get to know them so as to avoid issues and maximize value.
I'll first have to figure out whether my sample has a specific issue or not. Assuming that what I saw is representative of the lens potential, this would only show that the Otus is of course not the ideal lens some liked to think it would be.
Cheers,
Bernard