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Negative Lens Question

 
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clnfrd



Joined: 26 Mar 2002
Posts: 616
Location: Western Kentucky Lakes Area
PostPosted: Sat Aug 28, 2004 9:16 pm    Post subject: Reply with quote
I've been thinking about getting some negative lenses to experiment with. I have this question: if you sandwich a -1 and a -2, is the result a -3? Thanks. Fred.
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t.r.sanford



Joined: 10 Nov 2003
Posts: 812
Location: East Coast (Long Island)
PostPosted: Sun Aug 29, 2004 1:34 am    Post subject: Reply with quote
Yes, combining a lens of -1 diopter and a lens of -2 diopters produces a group with an effective focal length of -3 diopters -- more or less! For precise calculation, you need to take into account the distance separating the two elements.
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clnfrd



Joined: 26 Mar 2002
Posts: 616
Location: Western Kentucky Lakes Area
PostPosted: Sun Aug 29, 2004 12:01 pm    Post subject: Reply with quote
t.r.....Thanks!! That's all I needed to know. Fred.
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