Oh *that* one (he said, pretending that he hadn't forgotten all about it).
Piers
-----Original Message-----
From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
Sent: 21 June 2011 18:00
To: Olympus Camera Discussion
Subject: Re: [OM] m43 adapter
The DOF preview button on the OM lens.
Chuck Norcutt
On 6/21/2011 12:55 PM, Piers Hemy wrote:
> All agreed until your final sentence, Chuck. What DoF preview button
> do you have in mind? Is there such a button on any m43 adapter?
>
> Piers
>
> -----Original Message-----
> From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
> Sent: 21 June 2011 17:48
> To: Olympus Camera Discussion
> Subject: Re: [OM] m43 adapter
>
> 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
>>
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