Question: I have a lens that is “speckled”, what can cause this and what can I do?
Possible Causes: Lens was removed from the annealing stages and cooled under running water while too hot. If a lens is cooled under running water while hot, it may have a “speckled” appearance caused by localized differences in the rates of cooling of the lens surface. These speckles can be numerous, irregularly shaped.
Solution: The lenses should be air cooled for several minutes before running water over them. If you have a “speckled” lens, returning it to the annealing oven for 5 to 10 minutes will usually eliminate the issue
Posted on 9/16/2014 at 8:00:00 PM