Re: [OM] 49-72mm step up ring - reappeared?

[Ken Norton]

>
> If the 18mm OM lens has a 49mm thread size what is so special about a 49 -
> 72 step up ring. 49mm in Bolivia is 49mm in Iowa or Timbuktoo?!
>


49mm is the OD (outside diameter).  As I understand it, the issue is the ID
(inside diameter).

AG
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