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John Better

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  1. John Better
    As the title says, looking for a WLF diopter, it would look like this (except it would say 1,5 or 2,5):
  2. John Better
    What is a helicoid?
  3. John Better
    After a lot of chasing (and paying...) I managed to find an Apo-Symmar 150mm Makro, along with an ET67 extension tube, which according to the macro manual of Rollei, should allow me to focus to infinity: https://lens-db.com/schneider-kreuznach-makro-apo-symmar-hft-150mm-f46-pq/ Surprise surprise, the combo focuses only between 1 and 3 meters... The extension tube being a fixed thing, and the lens being in good shape, I suppose it's a matter of finding the right extension tubes...but which ones?
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