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Author Message   Waynemel Tinkerer Username: Waynemel Post Number: 63 Registered: 08-2009 Rating: N/A Votes: 0 Posted on Sunday, May 15, 2011 - 10:01 am:    I have aquired the Teleskop lens attachment for my Contaflex I. Do I need to compensate for the effective aperture when using this lens? I would assume I loose some speed.