View Single Post
Old 31st December 2015, 12:51 PM
rich's Avatar
rich rich is offline
Senior Member
Join Date: Nov 2008
Location: Shebbear, N Devon
Posts: 1,644

It could be that the front element is a thick piece of glass, or a number of elements cemented together, such that the mass of glass that needs to warm up is substantial, and that takes a while; meanwhile the lens temperature being below the dewpoint of the ambient air, you get condensation.

Other scopes may have less massive front elements which reach an equilibrium temperature more rapidly.
Reply With Quote