[Leica] OT: Bubbles in the Rear Element of 1940' - 1950's Lenses

[tedgrant at shaw.ca (Ted Grant)]

GREG LORENZO asked:
Subject: [Leica] OT: Bubbles in the Rear Element of 1940' - 1950's Lenses
>>> Will the existence of small bubbles in the rear element of a lens affect 
>>> image quality?
>> I don't have the lens to try out but I was surprised to see this.<<<

Hi Greg,
I vaguely re-call from years ago "looking for lenses with bubbles" because 
they signified a better lens. So the theory was in those days.

I had a 50 mm f1.5 on a Contax III with a bubbles in the glass and I don't 
re-call any kind of variations from them in the negs and prints.

Now on a test bench I suppose given lens standards of today bubbles maybe a 
no-no. But at that time 50's 60's bubbles were supposed to signify part of 
the molten glass cooling process and a positive marques.

ted

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