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| General photography questions and answers Discuss 8mm 18mm what does the mm mean?...Hi all just got my new 8mm and made me think what does the mm mean?... |
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30-06-2007, 19:03
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#1 (permalink) |
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Getting Comfy
Join Date: Apr 2007
Location: Wirral, Merseyside
Posts: 204
  
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8mm 18mm what does the mm mean?
Hi all just got my new 8mm and made me think what does the mm mean?
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30-06-2007, 20:02
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#2 (permalink) |
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Getting Comfy
Join Date: Nov 2006
Location: Prestwick, Scotland
Posts: 218
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Re: 8mm 18mm what does the mm mean?
Its millimetres?
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30-06-2007, 20:47
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#3 (permalink) |
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Getting Comfy
Join Date: Apr 2007
Location: Wirral, Merseyside
Posts: 204
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Re: 8mm 18mm what does the mm mean?
Hi i know its mm but what does it mean is it the size of the lens from point a to b? if you get what i mean
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30-06-2007, 21:08
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#4 (permalink) |
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Getting Comfy
Join Date: Nov 2006
Location: Prestwick, Scotland
Posts: 218
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Re: 8mm 18mm what does the mm mean?
Oh...yeah that makes more sense
 I'm not sure but I think it must be the distance between two pieces of glass inside the lens, i've never really thought about it! |
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30-06-2007, 21:13
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#5 (permalink) |
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Forum Regular
Join Date: Aug 2005
Location: Corfe Mullen, Wimborne, Dorset
Posts: 1,318
 
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Re: 8mm 18mm what does the mm mean?
try this Dave Focal Length and F-Stop Explanation
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