Extension tube T2 Set

Extension tubes like this are often useful for achieving focus.

The set contains three extension sleeves of different lengths: 7.5mm, 12mm and 30mm

Example of use:

• 7.5mm provides the correct distance for many ZWO cameras with RASA 8
• 12mm offers the correct distance for many Atik cameras with RASA 8
• 30mm converts ZWO cameras with filter slides to have a standard back focus of 55mm for use with a Schmidt-Cassegrain & EdgeHD

Sample calculation:

RASA 8 with a ZWO ASI 183 MC PRO camera:

• Back focus distance required for RASA 8 with included M42 (T-2) camera adapter: 25mm
• ZWO ASI 183 MC PRO back focus: 17.5mm
• In order to achieve the correct working distance, a 7.5mm spacer ring is required

Example: RASA 8 with an ATIK Horizon camera:

• Back focus distance required for RASA 8 with included M42 (T-2) camera adapter: 25 mm
• Back focus for ATIK horizon: 13mm
• In order to achieve the correct working distance, a 12mm M42 spacer ring is required