[rollei_list] Re: Spinning front taking lens- correction

That should be "centered", not "cantered"!
----- Original Message ----- From: "A. Lal" <alal@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, December 29, 2005 12:44 PM
Subject: [rollei_list] Re: Spinning front taking lens


Standard consumer optics are, in theory, axially symmetric so rotation should not matter.

The only thing I can think of is that if a lens is not perfectly cantered, then certain manufacturers might, during assembly, adjust the elements when mounting the optical cell to give best correction.
----- Original Message ----- From: "Jim Brick" <jim@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, December 29, 2005 12:33 PM
Subject: [rollei_list] Re: Spinning front taking lens


I'm not sure that I understand this lens spinning property.

I have always been told that in lenses that consist of more than one element, each element has a specific orientation with the other elements in the group. I was told that if I took a lens apart, I should mark each elements orientation so that it could be reassembled with each element oriented properly with respect to the other elements.

So a spinning element makes no sense to me.

??

Jim

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