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<p>[QUOTE=&quot;-jeffB, post: 2093073, member: 27832&quot;]Magnification lenses always degrade image quality. They usually distort the shape of the image (&quot;pincushion&quot; or &quot;barrel&quot; distortion), and they produce colored fringes (chromatic aberration). I have a stackable set; the weak one is okay, but the higher the power I use, the worse the distortion is. At high powers, only the center of the image is worth looking at.</p><p><br /></p><p>Extension tubes work well; they don&#039;t let in dust, they don&#039;t add distortion, they&#039;re easy to use, and they&#039;re cheap-ish. On the down side, they darken the image (you&#039;re spreading the same amount of light over a larger area), and even if you spring for a set that carries focus and aperture signals through to your lens, autofocus usually doesn&#039;t work very well with them. (If you&#039;re shooting macro, though, you probably want to use manual focus anyhow.)</p><p><br /></p><p>I haven&#039;t done the lens-reversal trick, so I have no advice there.</p><p><br /></p><p>I usually use an older Canon 100mm USM macro, and I usually don&#039;t need more magnification than that. I remember it being more difficult to use with the extension tubes, but I don&#039;t remember details. Don&#039;t rule out using tubes with the 70-200L; I&#039;ve used them with a 100-400L to get shots of butterflies, and it works, but I wasn&#039;t up to the technical challenge of managing focus and steadying the camera. I&#039;m thinking that by stacking all my tubes I was able to get pretty close to 1:1 magnification with that arrangement. The 70-200L is a fine lens, and it would be worth trying this.[/QUOTE]</p><p><br /></p>

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