This is designed to create an secure tube system using a Raynox DCR-150 or Raynox DCR-250 lens as tube lens. It includes the following:
 
1x MJKZZ VLE variable extension
1x M42-to-M43 adapter ring (M42x1 M43x0.75)
1x Camera mount of choice (EOS, Nikon, Sony, etc)
1x M49 to a set of RMS, M25x0.75, and M26x0.706 adapters
3x Simple 3 segment extension tubes
 
The benefit of using large diameter tube is to avoid vignnetting and to avoid internal reflection. Our tubes has anti-reflection kurl inside.
 
Note pictures shown above include some other items for demonstration purpose only.