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Tag Archives :55mm

What is the back focus?

Determining the correct back focus for your telescope can be a daunting task for both beginners and experienced astrophotographers. In this article, we’ll discuss why back focus distance is so important, all the factors you need to consider for back focus distance, and how to use adapters and spacers to get the perfect back focus distance.  ...

Read more  back focus,  optical path,  55mm