Extension Tubes and Spacer Rings

Extension tubes and spacer rings are often required to reach focus or to achieve the proper spacing between a focal reducer and the image plane. When attaching a camera to a refractor it is often necessary to replace the optical path length of the star diagonal with an extension tube. Focal reducers and field flatteners all have an optimal spacing to the image plane, and spacer rings as thin as 1 mm are commonly available for this purpose.

  • Orion T-Thread Spacer Ring Kit
  • Orion T-Thread Spacer Ring Kit

  • Use the Orion T-Thread Spacer Ring Kit to achieve proper spacing with astrophotography equipment and avoid fuzzy, out of focus images read more...
  • Our price: $39.00

  • Orion Telescope Eyepiece Extension Tube 1.25-inch
  • Orion Telescope Eyepiece Extension Tube 1.25-inch

  • Versatile extension adapter for 1.25" telescope eyepieces and accessories adds 2" of extension read more...
  • Our price: $19.00

  • Orion Telescope Eyepiece Extension Tube 2-inch
  • Orion Telescope Eyepiece Extension Tube 2-inch

  • Extension tube provides extra focuser "back travel" often needed for short-range terrestrial viewing through a telescope read more...
  • Our price: $22.00

  • TeleVue Extension Tube 2"
  • TeleVue Extension Tube 2"

  • The TeleVue 2 inch extension tube is used to provide more path length or "out" focus. read more...
  • Our price: $65.00

  • TeleVue Extension Tube 3.5"
  • TeleVue Extension Tube 3.5"

  • The TeleVue 3-1/2 inch extension tube provides more out focus when removing a star diagonal for photography or straight through viewing. read more...
  • Our price: $65.00

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