On Wednesday, April 27, 2005, at 03:24 PM, Nick Roberts wrote: > The only lens I have that has any bubbles is a 50mm f2 Zeiss Sonnar > for Contax. It performs exactly the same as my other copy of this > lens, as far as I can determine from normal photographic use. And it > has quite a few bubbles, too! In the past, I understand, bubbles were a sign of HIGH lens quality, because good glass for lenses could not be made in those days without bubbles. (Am I right, Richard?) Cheers.