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In this week's video I explain the concept of backfocus. Very simply, we need to put the camera's sensor in a very specific location. If the camera sensor is too close/far from the telescope or lens, you will not be able to focus. Thankfully, it's fairly easy to get this right!
Here's a link to the ZWO diagrams which I show in the video:
astronomy-imag...
Gear Links:
Nikon Lens Adapter
agenaastro.com...
ASI1600MM-Pro
agenaastro.com...