Re: [OM] Visited Macau

[Piers Hemy]

Ah, you mean a *rugby* football shaped aperture.  I was confused for a
moment...

;-)

Piers

-----Original Message-----
From: Jeff Keller [mailto:om-list@xxxxxxxxxxx] 
Sent: 15 August 2010 08:14
To: 'Olympus Camera Discussion'
Subject: Re: [OM] Visited Macau

Hi Michael,

I don't know if you've come across this: many LF cameras have the corners of
the focus screen clipped off so that when everything is set up including the
aperture stopped down you can look through the corners to see if the
aperture is round. If your focus screen has clipped corners you should be
able to see any mechanical vignetting show up as a football shaped aperture.

--snip

-- 
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