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

Link to filter effect on backfocus:    • BackFocus 101: How Filters Affect Ba...  

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