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(m42) Vivitar triplicatore!


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avatarjunior
sent on 02 Ottobre 2016 (23:55)    

in effetti alcuni asportano quella sorta di duplicatore che MTO 1000 ha all'interno dell'innesto; asportandolo diminuisce la focale ed aumenta la luminosità e, pare, la qualità. Un intervento da fare, sicuramente, è quello del "detensionamento" dello specchio posteriore. In ogni caso, comunque, i catadiottrici sono divertenti ed economici ma hanno una resa, soprattutto in termini di contrasto, inferiore delle ottiche tradizionali. Però negli anni 70/80 ho avuto la fortuna di usare il raro Minolta RF Rokkor-X 250mm f/5.6 che era veramente un'ottica eccellente ma che si trova solo a prezzi elevati.


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