The Wemacro tube clamp can hold M42 extension tubes with a 46mm~46.3 mm diameter. Or the Wemacro M42 tubes made for this clamp. Tighten the tube using the free Allen wrench provided. Specifications: Inner diameter 46.4 mm , Thickness 15mm 1/4 inch threaded hole at the bottom. Quick Release Plate with two clamps installed Quick Release Claps on mounting plate Example with Reversed Raynox Lens There are 4 M42 tubes in the example below. 42mm-Camera mount M42 tube 10mm 50mm 50mm 50mm Raynox reversed adapter M42 to M26 adapter Mitutoyo Tube with objective lens Working with the Wemacro Focus Rail The focus rail below uses 2 Quick Release Clamp and 1/4 inch Screws to fix the tube assembly on to the Focus Rail platform. Tube Pro on Focus Rail If your tube’s external diameter is smaller than 46.3 mm, please use paper or tapes around the tubes ensure a tight fit.
