Scroll down to the first message in this thread, and that's the explanation.
1/2000 in an OM-2 etc. is the 'mini shutter'. Since 4, 4T, Ti already go to
1/2000th, the mini shutter for those models should be faster , but testing
mine shows that while the mini shutter is slightly faster than 1/2000th, it
is not one stop faster. 1/4000th may not be feasible with a horizontal
cloth focal plane shutter.
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington, NY, 11743-4714,
631-424-2121, www.zuiko.com
Olympus OM Service since 1977
<:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:>
----- Original Message -----
From: "asud journal" <asudjournal@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Wednesday, February 23, 2005 9:36 AM
Subject: [OM] Re: OM-1 to OM-4T - worth an upgrade?
>
> Can you please explain about the 1/4000 "mini shutter" a little bit
> more john?
> It's a interseting thing to know for an OM4 user.
> Regards, Loïc.
>
> Le 23 févr. 05, à 14:46, John Hermanson a écrit :
>
>>
>> Theoretically, the 4, 4T/Ti would do a 'mini shutter' of about 1/4000.
>>
>> John Hermanson
>> Camtech Photo Services, Inc.
>> 21 South Lane, Huntington, NY, 11743-4714,
>> 631-424-2121, www.zuiko.com
>> Olympus OM Service since 1977
>> <:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:>
>> ----- Original Message -----
>> From: "John Hermanson" <omtech@xxxxxxxxx>
>> To: <olympus@xxxxxxxxxx>
>> Sent: Tuesday, February 22, 2005 9:17 AM
>> Subject: [OM] Re: OM-1 to OM-4T - worth an upgrade?
>>
>>
>>>
>>> Yes, the 2N does the same, so does OM-10 (with all that oil? NAH),
>>> OM-G,
>>> OM-20, OM-PC, OM-40, OM-F, OM-30, 2S, 4, 4T, 4Ti.
>>>
>>> John Hermanson
>>> Camtech Photo Services, Inc.
>>> 21 South Lane, Huntington, NY, 11743-4714,
>>> 631-424-2121, www.zuiko.com
>>> Olympus OM Service since 1977
>>> <:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:>
>>> ----- Original Message -----
>>> From: "Fernando Gonzalez Gentile" <fgnzalez@xxxxxxxxxxxxx>
>>> To: <olympus@xxxxxxxxxx>
>>> Sent: Monday, February 21, 2005 10:39 PM
>>> Subject: [OM] Re: OM-1 to OM-4T - worth an upgrade?
>>>
>>>
>>>> Wow! At last I hear about this on the list :^)
>>>> remember to have read about this on Modern Photog quite a few years
>>>> ago.
>>>> First time I tested this secret, with some skepticism, was on 1991
>>>> when
>>>> studying in Paris and wanted to shoot the top of the Place de la
>>>> Bastille
>>>> monument using my 200/4 @ f32. Sun was just above the figure at the
>>>> top,
>>>> and
>>>> although I screwed my Tamron linear pol., the E100 was to be exposed
>>>> with
>>>> the needle above on the red mark on Auto mode. To my surprise, sky
>>>> rendered
>>>> a saturated blue, a full stop underexposed I guess due to meter
>>>> reading
>>>> the
>>>> Sun on a clear sky. I repeated the test with the Tour Eiffel: dark
>>>> silouette
>>>> on a saturated clear blue sky, 28/2.8 @ f22 + Oly linear pol. as a
>>>> neutral
>>>> density filter.
>>>>
>>>> John, does the 2n behave the same? I suppose it does.
>>>> Tanks once again.
>>>>
>>>> Fernando.
>>>>
>>>>> From: "John Hermanson" <omtech@xxxxxxxxx>
>>>>> Reply-To: olympus@xxxxxxxxxx
>>>>> Date: Mon, 21 Feb 2005 11:03:42 -0500
>>>>> To: <olympus@xxxxxxxxxx>
>>>>> Subject: [OM] Re: OM-1 to OM-4T - worth an upgrade?
>>>>>
>>>>> BTW, an OM-2 that is properly setup, set on auto, has a 'secret' top
>>>>> shutter
>>>>> speed of 1/2000 th. That is, if, when on auto, the needle is
>>>>> pointing
>>>>> to
>>>>> 1000, when you open the lens one more stop, shutter will fire
>>>>> somewhere
>>>>> between 1/1500 - 1/2000th.
>>>>
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