Well, thanks for the answers, i find i have a plasmat tipe 300mm nikkor w and it is convertible, the front cell as a focal distance of around 800 or 900mm that probably will do, if i need it shorter i will add a close up in the other end.
i think almost all lenses are convertible (even if it´s just with one cell) probably with different grades of quality...
thank you very much
rui
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