RE: [OM] KEH repairs/lens cleaning

Subject: RE: [OM] KEH repairs/lens cleaning
From: "Daniel J. Mitchell" <DanielMitchell@xxxxxxxxxxxxx>
Date: Mon, 11 Feb 2002 17:17:34 -0700
> So, for a 50/1.8 lens, diameter of the glass is 28mm, so you could
> have a lump of muck 2.8mm wide stuck to the lens without it 
> affecting image quality.

 Yikes, that's a _lot_ of dirt. Anyone out there got an old 50/1.8 they want
to do some testing with? Presumably at the least, though, that's going to
reduce the incoming light by 1%, so everything'll get slightly dimmer --
pretty trivial change, though.

 Perhaps it's just to avoid scratches which will reflect light into
unfortunate places?

 -- dan

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