Thermal Equilibrium for Eyepieces.

I have often wondered if there is a cool down time for eyepieces as there is with telescopes. My dob is stored in an unheated garage and is simply rolled out and nearly ready to go. I keep my eyepieces stored in cases in the house. Would using eyepieces straight from the house for viewing affect the image one sees until the eyepieces reaches surrounding temp or is there no affect bringing a warmer eyepiece from inside and immediately using it at the scope?

Mike LeHere

I can sometimes see bad effects in my refractors
if I pop in a warm eyepiece / Barlow / diagonal
in a cold adapted scope. There are small tube
currents that suddenly appear. One fix is to
have the Barlow cold with the scope, or put a
clear 48mm filter on the end of the diagonal
(isolate eyepiece from rest of scope).

I suppose you might see a similar weak effect
in a Dob if you've got a warm eyepiece in a
cold scope.