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The work with tubes is quite impressive! Given my current set of lenses, which tube(s) would you recommend?
50 1.2ais, 85 2 ai, 105 2.5 ais, 135 2.8 ais, 180 2.8 ais (coming soon)
Get all three of the Nikon tubes: PK-11A, PK-12, and PK-13. Then you can choose what you need.
If you hunt around you can find them reasonably priced. Curtis has found non-Nikon tubes that work great as well.