It must be because on a 4/3 mount, an OM lens is at a different distance
from the "film plane" than it was designed for.
The register on an OM camera is 46.5mm, while the register on a 4/3 camera
is about 38.7mm
How thick is the MA-1 adaptor?
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of James Royall
Sent: 30 March 2005 23:50
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Figuring out depth of field with 4/3 adaptor
Hmm. I should have read the manual. I was sure that my focussing didn't
match the scale on the lens, but thought it can't be. Now I'm completely
flummoxed as to why this would be.
James
On 30 Mar 2005, at 06:15, Mark Dapoz wrote:
>
> On Tue, 29 Mar 2005, Moose wrote:
>>
>> But how do I work out depth of field using the scale on the lens?
>
> Keep in mind that the point at which an OM lens focuses on the E-1 may
> not line up with the distance markings on the lens. The Olympus
> instruction sheet for the OM adapter has the following note:
>
> "The distance scale on the OM system lens may not indicate the
> actual
> distance. Always use the viewfinder for focusing."
>
> You may have focused on something 5m away and the lens scale may
> indicate it's at 3m. This would of course render the DOF scales on
> the lens useless.
> -mark
>
>
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