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I've had the Sigma 150mm macro for a few years now, and I've tried it with most of the Raynox lenses except the MSN-505, which would anyway give riduculously high magnification. Even the MSN-202 starts at very high magnification you'd not want to use too often. A 1.4x converter is a very worthwhile investement, and the Sigma version spends most of its time on my Sigma 150mm. A Raynox DCR-150 will give magnification starting just under life-size on the lens without a converter, and I think goes to over 2x life size. With the 1.4x converter the Raynox DCR-250 gives well over 3x life size from what I remember. The results are very good with the Raynoxs, and they are probably the most cost effective way of getting extra magnification with good image quality. As others say, forget about ring flashes. On the Sigma 150mm you're much better off with a normal off camera flash and a softbox. It will probably be best to make your own softbox, as the best ones are the ones designed and made by those posting images on this forum. Look through the set-ups thread and you'll get lots of ideas.
The main advantage with converters is that the lens still focuses to infinity, and so there's no need to take them off to get less magnification.
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