The Conurus modifications are based on Sigma technology, thus they basically come with the same limitations of not working with cameras produced before 2001. But the incompatibilities with Conurus seem to go a bit further than that. Analog cameras won't work at all. Of the digital ones formerly the D30 and D60 were reported to be incompatible. According to the latest compatibility chart the converted lenses mounted to D60 and 500D suffer from periodic clicking, but will work ok.
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