Hi Steve
 
When refering to lenses Magnification would be the term to use
However with a barlow I believer multiplier for the magnification is quite 
appropriate 
multiplicity is definitely not the correct word in this case.
 
Barry
 

> From: azstef...@me.com
> Date: Fri, 8 Mar 2013 06:54:47 -0700
> To: stellarium-pubdevel@lists.sourceforge.net
> Subject: [Stellarium-pubdevel] Optical terminology
> 
> Hi Bogdan:
> 
> The best English for for Barlow and telescopes is "magnification" or 
> "magnification factor." In English, multiplicity would be used for the number 
> of instances of something, while magnification is the power that something 
> appears larger.
> 
> Steve
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Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester  
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the  
endpoint security space. For insight on selecting the right partner to 
tackle endpoint security challenges, access the full report. 
http://p.sf.net/sfu/symantec-dev2dev
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