51mm is not a thread size. It's the outside diameter of the lens barrel
having a 49mm filter thread. The 51mm hood is a "slip-on" rather than a
screw-in. It just slides over the outside of the barrel and locks with
a small thumbscrew. I don't have one here (I'm not home) but my
recollection is that the screw does not bear directly on the barrel so
it won't mar the surface. Take a closer look at two of these hoods
illustrated up front here:
<http://olympus.dementia.org/eSIF/om-sif/lensgroup/hoods.htm>
If you have a rectangular hood it needs a means of rotating the hood
independently of the filter thread in order to align the opening of the
hood with the film frame.
Chuck Norcutt
Nicholas Herndon wrote:
> Thanks Chuck, I knew about the two hoods that Olympus originally made. Had
> the chance to buy one, but $50+ for a hood is pretty steep--at least for me
> it is. And I want a rectangular hood.
> 51mm is even more of an odd thread size than 49mm.
> And the search continues...
>
>
> Welcome Nic. I don't know the answer. The eSIF (you need it)
> <http://olympus.dementia.org/eSIF/om-sif.htm> says two were available, a
> 51mm slide-on and a 49mm screw-in listed (but not illustrated) here:
> <http://olympus.dementia.org/eSIF/om-sif/lensgroup/hoods.htm>
> The same hoods are used on the 35/2.8 shift. Perhaps someone who has
> the real thing can post a pic and specs on dimensions to help you with
> finding a suitable alternative.
>
> Chuck Norcutt
>
> Nicholas Herndon wrote:
>> Hi all, I'm new to the mailing list (but not to Olympus cameras) and
>> by way of introduction, wanted to pose a question to the members here.
>> Anyone know of a good third party hood for the 21/3.5 Zuiko? I think
>> Hama made a rectangular UWA hood with a 49mm thread once upon a time,
>> but I can't for the life of me find anything similar now.
>>
>> -Nic
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