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Its exposure, camera lenses have electronics to allow the camera to do Auto---whatever. A telescope doesn't, so YOU need to use the camera in Manual mode only and tell it all the settings for exposure. The image in live view is a view split out from the lens so you can see what its pointed at but its NOT what the exposure of the photo will look like.
The viewfinder and live view should show you if you have focused corrected, there is NO Autofocus, no auto exposure no auto anything really when on a telescope, its all manual so its up to you. change things one at a time and take test shots to see the changes and learn what works for you and your gear.
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