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 Post subject: Macro Extensions
PostPosted: Sun Oct 07, 2007 4:09 pm 
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Joined: Mon Oct 01, 2007 6:45 am
Posts: 36
Location: Olympia, WA.
Anyone ever use them? And also, are they needed with a macro lense?

Random Factoid: It's Sunday right now and the washer sounds like a helicopter. Stupid energy efficient washers. :P

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 Post subject:
PostPosted: Sun Oct 07, 2007 5:32 pm 
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Joined: Sun Nov 05, 2006 11:08 pm
Posts: 7896
Location: Germany
No extension tubes needed with a macro-lens.
But you can also use them to extend the magnification of the macro-lens.
Unfortunately the IQ will suffer esp. when just using a "normal" lens or a zoom, as you'll leave the parameters that this lens was corrected for.
Alternatives:
Use a well corrected close-up lens to screw in front of your camera-lens (Canon 500D at around 100$).
Or use a tele-converter (more expensive) that improves magnification by the same factor as the focal length of your lens (max. 2x), so if your lens went down to say 1:3.8 it will go down to 1:1.9 with a 2x tele-converter.
IQ-wise the close-up lens might be the best alternative, as the tele-converter halves the resolution of your lens.

But to answer your question directly: no, I have no experience with extension tubes :(

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