Archived posting to the Leica Users Group, 1998/12/10

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Subject: [Leica] Bubbles? Erwin can you answer?
From: tedgrant@islandnet.com (Ted Grant)
Date: Thu, 10 Dec 1998 20:39:09 -0800

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