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Old Dec 7, 2005, 1:04 PM   #1
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I'm looking for a little help here. I only have one true macro lens, the sigma 50mm f2.8. I have several other lenses also, but I'm wondering if an extension tube would be of any benefit to me. I also have a 50mm 1.8 and the 85 1.8, and should be getting my 28mm 1.8 tomorrow, plus a few sigma zooms, 70-200 2.8, 24-70mm 2x8 and the 17-35mm 2.8-4. I'm not sure which if any of these a extension tube will work with, but would appreciate some opinions.
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Old Dec 7, 2005, 1:45 PM   #2
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someone correct me if i'm wrong... but if i remember correctly, you benefit the most from an extension tube when it's the same focal length as the lens...

I.E. if you pack up a bunch of tubes that total up to 70mm and then try the sigma 70-200 on 70mm, then i THINK it's a macro...

Focal length of the lens divided by Total length of the tubes

= macro ratio... So in the previous case 70 / 70 ~1:1

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