Archived posting to the Leica Users Group, 2004/11/04

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Subject: [Leica] LHSA convention cluster bombs Part One The Beginning.
From: mark at rabinergroup.com (Mark Rabiner)
Date: Thu Nov 4 20:17:56 2004
 
On 11/3/04 11:31 PM, "Frank Dernie" <Frank.Dernie@btinternet.com> typed:

> Due to the wavelength dependancy of refraction lenses do not focus all
> colours in the same plane at once. Acromats are corrected such that two
> colours are in focus in the same plane at once, apocromats are
> corrected such that 3 colours are in focus at the same plane at once.
> Other wavelengths are not in focus causing colour fringing and lack of
> sharpness. The extent to which the other colours are OOF is lens design
> dependant. Apo lenses should be sharper than non apo.
> Frank
> 


And super acromats like on the Hasselblad?
What does THAT mean?

Must be all three wavelengths of light in line with FM Radio.



Mark Rabiner
Photography
Portland Oregon
http://rabinergroup.com/
Replies: Reply from henningw at archiphoto.com (Henning Wulff) ([Leica] LHSA convention cluster bombs Part One The Beginning.)
 In reply to: Message from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] LHSA convention cluster bombs Part One The Beginning.)