T-2 / M-48 fine tuning ring

This ring allows adjusting distances with more precision as with extension tubes. It fits above the T2 filter thread of your adapter.

Fields of use:

• Optimal back focus adjustment between camera / off-axis guider/corrector
• Prevents threads from blocking
• Too long T2 threads can be shortened

Technical details:

• Stainless steel
• 0.3, 0.5, 1, 1.5 mm thick (depends on the model)
• Inner bore diameter:
  • 42,1mm (M-42 version)
  • 49mm (M-48 version)
• Outer diameter: 55 mm:
  • 55mm (M-42 version)
  • 60mm (M-48 version)