Celestron M42 Spacer Ring Kit

  Optimize your astroimaging setup with the Celestron M42 Spacer Ring Kit, designed to precisely adjust the back-focus distance between your camera and telescope. This kit is essential for achieving the best possible astroimages, especially when dealing with full-frame sensors where improper back-focus can lead to elongated stars at the image corners. The kit includes three spacer rings of varying lengths (7.5mm, 12mm, 30mm), each crafted to fit standard male and female T-Threads commonly found on T-Rings and T-Adapters. For example, using a RASA 8 telescope with a ZWO ASI 183 MC PRO camera requires a specific back-focus distance. The RASA 8, with its included M42 camera adapter, has a required back-focus distance of 25mm, while the ZWO ASI 183 MC PRO camera consumes 17.5mm of back-focus. To achieve the correct back-focus distance in this scenario, a 7.5mm M42 spacer ring is necessary. The Celestron M42 Spacer Ring kit caters to various popular Celestron optical tubes and T-thread came