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unusual mirror lens
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PostPosted: Fri Oct 14, 2011 12:50 pm    Post subject: unusual mirror lens Reply with quote

I thought the focal length is unusual.
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PostPosted: Fri Oct 14, 2011 8:35 pm    Post subject: Reply with quote

Yes, I don't remember seeing a 650mm before. This looks very like the Sigma 600mm f8. Since stretching the focal length without changing the diameter would give f8.7, I suspect the designs are strongly related. BTW, I have a copy of the Sigma, and it isn't very good Laughing