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What could this be for ?


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When I bought my 90mm f/2.8 Tele-Elmarit there was something like a Filter Ring screwed to the front which had the following marked on it : 5.5 and Canada 11251 together with a flat front lens cap which fits the front of the filter ring and this has a 39 dia and the number 11252. Can anyone tell me what is its purpose please ?? :confused:

 

Regards

 

Mike Bidwell

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