Back-Focus 101: Celestron 8" EdgeHD SCT (no reducer)

The Celestron EdgeHD design corrects for much of the aberration and field curvature inherent in the standard Schmidt-Cassegrain. To achieve this correction, the camera sensor must be placed a precise distance away from the baffle-tube lens element. For the Celestron 8" EdgeHD, this distance is 133.35mm. In this episode, of Back-Focus 101 I demonstrate some basic and "advanced" ways to get the correct back-focus spacing using this telescope. It should be noted that when using the Celestron 0.7x Reducer Lens for the 8" EdgeHD, the required back-focus spacing changes. The back-focus requirement of this telescope with the Celestron 0.7x Reducer will be shown in the next episode of Back-Focus 101.

Link to filter effect on back-focus:    • Back-Focus 101: How Filters Affect Ba...  

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