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28 mm ‘lux asph front end filter ring question


Dsauro

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Hi all

This is most likely a silly question....but here I go 

I just purchased a new 1.4 28 ‘lux.  I also purchased an orange and 4 stop ND filter.  When I tried to screw in the filters after taking off the lens hood, I noticed another “blank” screw in filter/filter ring.    I had to remove this ‘ring” to reveal the inner threads in order to screw in the orange/ND filters.

my question,  when I’m not using a filter, should I replace this Filter ring?  I guess I’m asking what is the purposes of this  filter ring?  To protect the threads?  Other?  The lens hood screws on just fine with/without the filter ring 

thanks 

 

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