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<p>[QUOTE=&quot;Dave M, post: 2093773, member: 17469&quot;]I&#039;m noticing that those extension tubes do not pass on the signals from the camera for focus or aperture setting. So it looks like you&#039;ll be shooting with the lens at maximum aperture, which could be a problem...</p><p><br /></p><p>Sigma and Tamron make good 3rd party lenses for the Canon mount, though I don&#039;t know the product line to tell you which ones are good macro lenses.[/QUOTE]</p><p><br /></p>

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