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B. Gohacki: UV Topcor 100mm f/4 Front Cell
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B. Gohacki: UV Topcor 100mm Focus scale removal and infinity adjustment
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B. Gohacki: UV Topcor 100mm f/4 Outer barrel components
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B. Gohacki: UV Topcor 100mm f/4 Helical Sync
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B. Gohacki: UV Topcor 100mm f/4 Aperture Assembly
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B. Gohacki: UV Topcor 100mm f/4 Helical disassembled
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B. Gohacki: UV Topcor 100mm f/4 The lens pulled apart