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[OM] Re: OM40 / OMG OM2 OM2n and T10 Ring Flash

Subject: [OM] Re: OM40 / OMG OM2 OM2n and T10 Ring Flash
From: Michael Kopp <mkopp@xxxxxxxxxx>
Date: Sat, 4 Sep 2004 09:22:27 +1200
>The PC / 40 has a lot of qualities of the OM-10 / G, including plastic top
>and bottom covers.
>_________________________________
>John Hermanson

"Qualities"?

<grin>

Poor-man's versions of the Mercedes ...

M<



>Camtech Photo Services, Inc.
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>_________________________________
>----- Original Message -----
>From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
>To: <olympus@xxxxxxxxxx>
>Sent: Thursday, September 02, 2004 8:49 PM
>Subject: [OM] Re: OM40 / OMG OM2 OM2n and T10 Ring Flash
>
>
>>  As Jim says, the OM40 is the OMPC in the US, not the OMG.
>>
>>  The OTF functions of the OM40 are essentially the same as the OM-4
>>  rather than the older OM-2(n), just to be precise.
>>
>>  In any case, the T-1 should work properly with it. I have noticed that
>>  OM40(PC)s seem to have poorer quality metal/coatings on the flash shoe
>>  contacts than the single digit bodies. I have had odd flash problems
>>  with them that were cleared up by careful, thorough cleaning of the
>>  contacts on the flast shoe and the flash. It could be as simple as
>>  slightly different pressure, location and/or cleanliness on the part of
>>  the T-1contacts vs. the T32 combined with slightly corroded flash shoe
>>  contacts. At least that is one simple explanation that has been true for
>>  me in the past that might solve your problem.
>>
>>  I don't know if you are aware of it, but the 2 Oly specific contacts on
>>  the bottom of the T series flashes, including the T-1, are spring loaded
>>  and pushed back up into the foot when not on an Oly shoe. The little
>>  plastic prong on the bottom of the foot that does this must drop into
>>  the dimple on the shoe to drop the contacts down. Anything in the dimple
>>  which keeps the prong from fully deploying will reduce the pressure of
>>  the flash contacts on the shoe contacts. It's a clever design, but less
>>  reliable than fixed springy contacts because it lowers the contacts
>>  against the shoe rather than having them wipe across, which tends to
>>  clean off corrosion. The single contact in the center that is used by
>>  all shoes is fixed and wipes across the shoe contact into place.
>>
>>  I hope that helps.
>>
>>  Moose
>>
>>  Michael Kopp wrote:
>>
>>  >The OM40 works fine with a T32, making it produce flashes of varying
>>  >brightness (power/time) depending on f/stop and distance as it's
>>  >supposed to do.
>>  >
>>  >It does not seem to do this with the T10, which produces what appears
>>  >to be a full-power flash no matter what the f/stop or distance......
>>  >
>>  >
>>
>>
>>
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