28mm M-Rokkor and the Disappearing Spots

mac_wt said:
This evening I used my Rokkor 28mm indoor, during a birthday party and the white spots, that formed a neat circle all around the lens before, were gone!. I'm pretty sure the spots were still there the last time I used the lens less than a week ago. In between it had been sitting in my camera bag in the garage.
Click to expand...

FYI: The spots have returned since then. Still a nice lens. A bit weird that nobody seems to know what these spots are exactly.

Wim
 
My understanding is that this is a flaw in the cement between a pair of elements in the lens. And that this partial separation is seen only on the 28mm Rokkor made for the CLE, presumably because they used this particular cement only with this lens. Why it might disappear and reappear is an interesting question! Temperature? Barometric pressure?
 
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