Olympus-OM
[Top] [All Lists]

[OM] Oly 4/3 vs m4/3 lens mounts and adapters

Subject: [OM] Oly 4/3 vs m4/3 lens mounts and adapters
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 14 May 2013 19:40:09 -0400
Can someone who has both systems verify whether or not a 4/3 lens fits 
on a m4/3 camera?  I know it won't focus properly and maybe not even 
operate electrically.  My only real concern is whether a 4/3 lens (or OM 
to 4/3 adapter) physically fits into an m4/3 body.

The reason I ask is that I was trying to use my OM bellows and slide 
copier today to see if I could copy slides onto my E-M5.  To do that I 
need a magnification of approx 0.5X.  If I had a Zuiko 80/4 short mount 
macro lens for the bellows I'd be OK.  But my only two macro lenses are 
my 90/2.5 Viv S1 and my 50/3.5 Zuiko.

I don't think I can get the 90/2.5 to work at all since at 0.5X I think 
the image of a slide is somewhere beyond the length of the bellows rail. 
  The 50/3.5 macro is only designed to do about 0.68X on the bellows. 
The bellows itself prevents it from getting to 0.5X.  The limitation is 
imposed by the minimum separation of the lens board and camera mounting 
board.  According to my possibly dodgy calculations the image plane 
needs to be brought forward about 14mm.  If you were using an OM or 4/3 
body that wouldn't be possible.  However, I note that the 4/3 to OM 
adapter is about 20mm shorter than the m4/3 adapter.  If I had a 4/3 
adapter on the m4/3 body I think that would give me the extra range I 
need to bring the image plane in and get the 50/3.5 to do 0.5X or 
slightly smaller.

So, can someone answer the physical compatibility question between the 
two mounts, ie, will a 4/3 lens fit onto a m4/3 mount even though it 
might not actually work electrically and certainly can't focus even if 
it physically fits?

Assuming it does, anyone got a spare OM to 4/3 mount you'd like to move 
on?  Maybe an old one with no AF confirmation chip?  I won't be needing 
anything like that.

Chuck Norcutt
-- 
_________________________________________________________________
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