Is there a list or table of distances the tubes will give you ie if the closest a lens will focus is 1 mtr what will it be with a tube thank you
grandadraymond Goldmember  1,946 posts Likes: 1 Joined Apr 2006 Location: Lancashire UK More info | Apr 17, 2010 16:49 | #1 Is there a list or table of distances the tubes will give you ie if the closest a lens will focus is 1 mtr what will it be with a tube thank you
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Jon Cream of the Crop  69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Apr 17, 2010 18:11 | #2 The effect of tubes depends on the focal length of the lens they're used with. So a 12 mm tube on a 50 mm lens with 1 m. minimum focusing distance would get you to 309 mm. A 200 mm lens with 1 m. min. focusing distance would only get you to 845 mm with the same 12 mm tube. Jon
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grandadraymond THREAD STARTER Goldmember 1,946 posts Likes: 1 Joined Apr 2006 Location: Lancashire UK More info | Apr 18, 2010 02:34 | #3 Jon wrote in post #10014132  The effect of tubes depends on the focal length of the lens they're used with. So a 12 mm tube on a 50 mm lens with 1 m. minimum focusing distance would get you to 309 mm. A 200 mm lens with 1 m. min. focusing distance would only get you to 845 mm with the same 12 mm tube. Right thank you Jon
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