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Re: [OM] Re: olympus-digest V2 #1295

Subject: Re: [OM] Re: olympus-digest V2 #1295
From: "george" <geanders@xxxxxxxxx>
Date: Wed, 15 Dec 1999 14:17:22 -0800
Sounds like the problem with the Nikon and Minolta solution is that you need
a special adapter to open them up past fully closed?

George


>===============
>The neat thing about the reverse mate is that is has a ring that goes on
the
>bayonet side of the lens when rerversed and stops down the aperture for
you.
>Without this how can you stop down a reversed lens?
>===============
>
>it's a problem with OM mount.  Nikon and Minolta manual focus lenses solve
>this problem by having the "resting" state of the aperture when it is
>not mounted be closed.  when the lens is mounted, a little lever holds
>the aperture open, and when a pic is taken, releases it to go back closed.
>thus, you won't get an auto-diapragm with one of these lenses, but you
>don't need anything special to reverse them.
>
>at the other end of hte spectrum are EOS and Maxxum with electrical
>contacts to stop down the lens.  just a simple thing like inspecting
>the aperture blades for oil leaks, as one would want to do when purchasing
>a used lens, is a non-trivial operation.
>
>Joseph
>
>
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