This post is the first part of a small series showing how to connect a Canon EOS DSLR to the Celestron NexStar 4SE for prime-focus astrophotography. Before assembling anything, here are the individual components you need: the T-Adapter-C90, Barlow T-Adapter 1¼ inches, a Canon EOS T-ring, and the Canon EOS 40D camera body.
Photographing the parts separately helps beginners understand how each piece looks and where it will eventually fit in the optical path. Later posts in this series will show the full assembly and the final connection to the telescope.
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| T-Adapter-C90, Barlow T-Adapter 1 1/4 inches, T-ring for Canon EOS, Canon 40D - Astrophotograpgy adapter setup for Celestron 4SE |
Components Shown in the Photo
- Canon EOS 40D DSLR camera body
- Celestron T-Adapter-C90 (93635-A)
- Barlow T-Adapter 1¼ inches (Celestron 93640)
- Canon EOS T-ring
This post only shows the individual pieces. In the next steps, you will see how these parts combine into a full optical train for prime-focus imaging or higher-magnification setups using the 1¼-inch Barlow T-Adapter. By understanding the components first, it becomes much easier to follow the later assembly photos and the final telescope-to-camera configuration.
Assembly Series: Connecting a Canon EOS Camera to the Celestron NexStar 4SE
- Part 1 – Components: T-Adapter-C90, Barlow T-Adapter 1¼", T-ring, Canon 40D (this page)
- Part 2 – NexStar 4SE with T-Adapter-C90 and Canon EOS 40D
- Part 3 – Assembled configuration with Barlow T-Adapter and Canon EOS 40D
- Part 4 – 4SE telescope with Barlow T-Adapter 1¼", Erect Image Diagonal, and Canon EOS 40D
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