|
You'll probably find examples of long life from both standard Al + quartz Vs Enhanced + quartz. It depends how well the coatings are done. It's probably easier to get reasonable standard coatings than enhanced though. My own personal experience hasn't been good with enhanced coatings with one 8" mirror I had done lasting about 6 months before large spots started to show on it. It was redone by someone else and is much better the second time round. But I've never has problems with standard Al coatings, unless not overcoated with anything. No doubt others will have their views too.
Clear skies
|