Olympus-OM
[Top] [All Lists]

Re: [OM] m43 adapter

Subject: Re: [OM] m43 adapter
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 21 Jun 2011 12:48:17 -0400
Not quite correct.  OM lenses are normally wide open independent of the 
aperture ring.  The lens is closed to the pre-set position at the time 
of exposure by the stop-down arm of an OM camera body.  When you have an 
OM lens on an adapter something has to take the place of the OM body's 
stop-down arm.  If you inspect the lens side of your adapter carefully 
you will see some sort of pin sticking out from the inside rim.  The 
purpose of that pin is to catch the stop-down arm on the lens and force 
the diaphragm closed when you move the aperture ring.

Remove that pin and the lens will stay open all the time... just as it 
is when it's not mounted on a body.  Some people prefer to remove the 
pin and force the lens closed at the time of exposure by pressing on the 
DOF preview button.

Chuck Norcutt


On 6/21/2011 12:28 PM, George Themelis wrote:
> The adapter that I have is a spacer with the correct ends for the
> connections.  The aperture is controlled by the lens and stays where you put
> it.  So you if you want to open it to focus and then close it to shoot, you
> just turn the aperture ring of the lens.  Nothing to do with the adapter.
>
> George
>
-- 
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz