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Old Nov 16, 2011, 10:34 AM   #1
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Hello,
i have an old kit lens EF-S 18-55 mm 3.5-5.6 and i was wondering can be used with extension tubes to be transformed into a macro lens, do not have the budget for now to purchase a macro lens.
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Old Nov 16, 2011, 11:05 AM   #2
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Extension tubes are a great, inexpensive way to get into macrophotography. But what extension tubes do is magnify the flaws in the lens you use them with. Unfortunately, the early, unstabilized 18-55 isn't very good, and it's pretty dim for macro work, so you may not be pleased with the results.

Do you have any other lenses you could use?
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Old Nov 17, 2011, 7:38 AM   #3
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I do have a Sigma 24-70 mm 2.8 EX DG and a Canon 70-200 4L USM
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Old Nov 17, 2011, 9:33 AM   #4
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... both of which would be much better candidates for use with extension tubes.
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Old Nov 17, 2011, 9:35 AM   #5
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BTW, since Canon uses optical image stabilization in some of it's lenses, that stabilization would continue to work when you use extension tubes.
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Old Nov 17, 2011, 11:36 AM   #6
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BTW, there are two kinds of third party extension tubes. One is made by Kenko and looks very much like Kenko's teleconverters, right down to the molded plastic lens release button. These are sold under a variety of brand names, support autoexposure and autofocus, and are of good quality. The second kind uses formed sheet metal lens release levers, and are not made very well. They may or may not support AE and/or AF, they are prone to like leaks and probably can't support the heavy lenses you have..
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Old Nov 17, 2011, 4:18 PM   #7
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hello
some macro tubes do not have a contact terminal at the camera end and so will not AF nor will have any electronic functionality.
the lcd will read F 00
the depth of field is insanely short
the effects surreal
you will need a ruler and a tripod to get started to find out the min. focus distance, once you figure that out its is an cheap way to do macro.
as with anything else you will need practice till you figure out how the tubes behave.
a table. a lamp, tripod, flower ( because it has different depths of texture)
would be an ideal starting point.
cheers
pete
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Old Nov 17, 2011, 4:24 PM   #8
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You should also be aware that the same tube on different lenses will produce different results, even if the lenses are the same focal length. Every combination is unique. Get used to it.
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Old Nov 17, 2011, 4:33 PM   #9
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Do not go cheap on the tubes, if you go that route. You will need Aperture control to off set the shallow dof that pete mention. You will be at F22-32 most the time if you to have of the object in focus and the back ground blurred. AF and IS are not as big a deal, as you will be MF with IS off allot if you do allot of true macro at 1:1
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Old Nov 17, 2011, 5:32 PM   #10
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Actually, AF with extension tubes is pretty good. Instead of focusing from 3 feet to infinity, for instance, you'll likely be focusing from 8 inches to 12 inches, so focusing will be very accurate. Very slow, but very accurate.

And since the purpose of optical image stabilization is to project a stabilized image out the back of the lens, extension tubes don't adversely affect stabilization the way they do with sensor shift image stabilization.
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