Your best bet is not to cap anything until the scope, EP's or the like have come back to the temperature of their place of storage.
I have observatory so everything pretty much says outside, and at the ambient temp of that particular time of the day or night, however after a nights imaging, and i have closed the observatory for the night i still leave all caps and covers off until the next day so all things can reach ambient temp again.
And even run a small fan just to circulate the air to assist and drying off dew etc.
Leon
