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

Subject: Re: [OM] 49-72mm step up ring - reappeared?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 03 Sep 2009 09:24:19 -0400
Or buy a 49-67 and a 67-72.  Maybe cheaper than the filter and you don't 
have to remove the glass.

Chuck Norcutt

Moose wrote:
> JOHN DUGGAN wrote:
>> B+H advertise a 49 to72mm step up adapter.....for about $6. Could this not 
>> be adapted/machined to fit?
>>   
> 
> To quote Wayne H from three weeks ago:
> =========================================
> 
> "Really quite a simple operation.  Buy yourself a 49->72mm step up ring, it 
> probably won't screw onto your 18mm because it needs to screw down into a 
> groove and the inside diameter of the stepping ring is too small.  Use the
> lathe to bore out the inside diameter until it fits into the 18mm's groove. 
> The stepping ring won't be as strong as when it started but probably no worse 
> than the Oly part.  Depending on the depth of the stepping ring you may need 
> to extend the 72mm part so that mounted filters don't touch the front 
> element.  You can do this by getting a cheap 72mm filter and removing the 
> glass and mounting this on the step up ring.
> 
> ...Wayne
> 
> =========================================
> and from 6/9/2007, including pics of a conversion, as referenced last month 
> by Chuck:
> =========================================
> A few weeks ago there was some discussion about the Olympus hood/filter
> adapter for the OM Zuiko 18mm f3.5.  I volunteered to bore out a 49-->72mm
> step-up ring to see if it could be used as a substitute hood/filter adapter.
> I obtained a cheap (about $US7) step-up ring from www.camerafilters.com and
> bored the inside of the 49mm threaded section on the lathe from 45.2mm to
> 46.5mm (same ID as the Oly hood) which fitted perfectly on the 18/3.5 even
> though the threaded section was 0.5mm longer than the Oly version.  As the
> step-up ring is flat the front element of the 18/3.5 still projects about
> 1.5 mm from the front of the ring so I added a filter ring from which I had
> removed the glass.  As the filter was a fairly thick the resultant hood is
> about 2mm deeper than the Oly hood but allowed me to mount a thin Hoya on
> top of the combination without getting any vignetting.
> 
> This link takes you to a page which shows a few images of the step-up ring
> mounted on the 18/3.5:
> 
> http://lrh.structuregraphs.com/test/hood.htm 
> 
> The bottom line is that it seems a substitute hood can be made fairly easily
> if you can't find/afford the original Oly.
> 
> ...Wayne
> 
> 
-- 
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