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[OM] Re: WTB a lens to replace the other

Subject: [OM] Re: WTB a lens to replace the other
From: Andrew Fildes <afildes@xxxxxxxxxxxxx>
Date: Sat, 3 Mar 2007 11:00:17 +1100
We need someone to test that. Using a Tamron Adaptall or a T mount.
I've got the Tammie 500 lens but no 4/3 body. Er, Wayne....?
Andrew Fildes
afildes@xxxxxxxxxxxxx



On 03/03/2007, at 10:44 AM, Chuck Norcutt wrote:

> I've never thought much about the problem but in thinking about it  
> now I
> assume that there are some physical constraints in passing the image
> through a hole in the primary mirror with the hole being large  
> enough to
> deliver an image across a full size 35mm frame.  (no one is yet making
> mirror lenses for 4/3 mounts).  If the mirror was small then there
> wouldn't be much left after making a large hole in it.  A shorter  
> focal
> length lens could have a larger mirror if it was a very fast optic but
> very fast lenses have lots of other downsides not the least of  
> which is
> cost and weight.



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