75mm Noctilux broken filters

[Bob R]

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I have the 75mm Noctilux and have experienced two broken UV filters. The filters were the B&W XS-Pro Digital 010 MRC nano. The filters were on the lens and were found broken when the lens was taken out of the Lowepro case. I also have the 90mm f/1.5 and 50mm f/.95 lense with similar filters but have never had a problem. I am suspecting now that the unique lens cap on the 75mm is causing the problem. Has anyone else had a similar issue?  Is there another UV filter with a thicker ring than would be better or do I just need to store the lens without a filter installed. 

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[jaapv]

UV filters are basically not designed for protection but, umm, to filter UV. Get a decent protective filter B+W 007 or Heliopan Protective. Those are considerably stronger  but thinner glass  and will produce fewer aberrations. 
If you manage to  break filters I would not advise you to go without.