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

Subject: Re: [OM] 49-72mm step up ring - reappeared?
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Wed, 2 Sep 2009 18:40:11 -0500
>
> 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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