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08/10/2010 10:46:07 AM · #1 |
| I've been researching extension tubes and they seem like a reasonably priced macro option for right now. One thing I have not found an answer to (including a forum search here) is what is the difference between "minimum focusing distance" and "working distance"? |
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08/10/2010 10:48:33 AM · #2 |
Working distance is the distance from the front element to the subject. Focusing distance is the distance from the film plane (the little o with a line through it that should be somewhere on top, and shows you how "deep" the sensor is located) to the subject.
ETA: Focusing distance = Working distance + total lens length + extension tube length + flange focal distance.
The lens length may change when focusing, but I'm not sure that really matters. If it does, the difference is too small to matter.
Your camera has a 44mm flange focal distance. Add to that the true length of your lens (find specs) and extension tube (whatever's written on it), and the working distance. That should be your focusing distance.
Message edited by author 2010-08-10 10:56:54. |
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08/10/2010 10:50:17 AM · #3 |
| Aha. Big difference. Thanks. |
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08/10/2010 11:01:05 AM · #4 |
| Focal plane mark. Also, I edited my post above. |
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