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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