Thank you Andy.
The guy I purchased the lens off tells me he has no memory of any plastic sleeve as you describe.
I can see the 'U' shaped section you mention (rear of the lens)........I had seen this but thought "it is too small/thin to accept any filter-I assume the filter must also be extremely thin.
I have emailed SigmaUK and asked where I can purchase these items.
You might recall my post re' Dunham Massey Old Hall-it was then I decided to get a wide angle lens and this one came up at the right price......all I have to do now is learn to use & get the best out of it.
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Robert McCluskey
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