[OM] Re: actual 18 mm value at the moment?

[Wayne Harridge]

> 
> But that's assuming the thread pitch is the same as well.  
> That might not be true.
> 

Thread pitch is standard, at least screwing an ordinary 49mm filter onto the
hood works ok.

I just checked the internal diameter of the Oly 49-->72 at 46.50 mm, while a
cheapo step up ring was 46.00mm

...Wayne


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