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 Back-Focus   Please consider making your astronomy purchases from my Agena Astro and/or High Point Scientific affiliate links below. This helps me significantly in funding the channel and allows me to produce my tutorials and unbiased reviews that you can trust. My Agena Astro Affiliate Link: https://bit.ly/3MiW5LL My High Point Scientific Affiliate Link: https://bit.ly/44XcvTv AFFILIATE LINKS: This description contains AgenaAstro and High Point Scientific affiliate links. If you choose to purchase after clicking a link, I may receive a commission at no extra cost to you. This helps me significantly in funding the channel and astronomy purchases, allowing me to produce tutorials and unbiased reviews that you can trust. If you enjoyed the information presented and/or found it helpful, please support my channel by making your astronomy purchases through my AgenaAstro or High Point Scientific link above. Thank you!