Archived posting to the Leica Users Group, 1998/12/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Erwin if your reading the bubble thread would you please give us your unbiased technical expertise opinion on the subject: effect or defect possiblilties of a lens with bubbles. Many thanks, ted >>yet accept a brand-new lens with a "huge bubble" in the front >>element. >> >>Regards, >>Nigel > >Well Nigel, it turns out that back then, perhaps even now, bubbles were an >accepted artifact in some premium quality lenses. Some of the Zeiss >Hasselblad lenses were that way. It, in no way, effects lens performance. > >And from Ted: >>I recall the first Leica lens I got many moons ago and looked in to it and >>there were bubbles!!! I just about went nuts, called raising hell about >>cheap coke bottle glass and what's all the hype about perfection etc. Then >>it was quitely explained to me what happens with high end optical glass as >>it cools and bubbles occur, No big deal, relax ted go take pictures and >>call us back if you think you have a problem. >> >>Guess what? NO PROBLEM! :) Just beautiful cut images on film. > >A UV filter ALWAYS effects performance. Two more air/glass surfaces. A >bubble effects perhaps .001% of the photons passing through the lens. >Totally insignificant. > >Jim Ted Grant This is Our Work. The Legacy of Sir William Osler. http://www.islandnet.com/~tedgrant