Hello, I appreciate all the above information. I too was going to buy either digital optics, or opteka 2x telephoto for my Sony F-717. Would still like to know if anyone has experience with Raynox teleconverters. Also Opteka makes which seems a little more professional 2x telephoto selling on ebay with 7 elements & 5 groups. I understand that a 7 element telephoto gives the best quality. If anyone has any experience with this lens or info would appreciate your comments.......... Mike
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