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<p>[QUOTE=&quot;-jeffB, post: 2093809, member: 27832&quot;]My set of extension tubes is from Kenko, 12mm, 20mm and 36mm, stackable. They pass focus and aperture info. I see that they&#039;re over $100 on Amazon. I didn&#039;t remember them being that expensive, but it was a long time ago. I see other units that claim to pass focus and aperture signals for under $50.</p><p><br /></p><p>I wasn&#039;t familiar with the trick of pulling the lens off the camera body while it&#039;s stopped down (using DOF preview). That makes me nervous, but I don&#039;t know for a fact that it&#039;s a bad idea. It certainly seems inconvenient.</p><p><br /></p><p>You do &quot;lose light&quot; with tubes, but only because of the geometry -- the light heading toward your sensor travels further, and spreads out more. There isn&#039;t really anything to do about it, but if you&#039;re using a good mount and mirror lockup/remote release, you can just lengthen the exposure to compensate. Again, AF doesn&#039;t work very well, but you don&#039;t want it for extreme macro work anyhow.[/QUOTE]</p><p><br /></p>

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