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Re: [OM] Lens element separation

Subject: Re: [OM] Lens element separation
From: Chuck Norcutt <norcutt@xxxxxxx>
Date: Thu, 01 Apr 1999 08:39:10 -0500
I've been keenly following the saga of disassembling lenses for
cleaning... probably because I love to take stuff apart.  But a modern,
multi-element lens is something I've not attempted yet.

>From my amateur telescope making days (of many, many years ago) I seem
to recall an admonition to mark the edge of the elements so that they
could always go back together in the same orientation.  That advice was
probably for large, hand-ground, achromatic doublets.  I think the
rationale was that the optical surfaces were not necessarily perfectly
parallel to each other (slight edge thickness variations).  But, since
all of the elements suffer from this, the imperfections will tend to
cancel out (or be magnified) depending on how the elements are assembled
relative to each other.

Is this correct?  And furthermore, does it have any meaning with respect
to precision, machine-ground lenses?

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