Why do we see a vast expanse of white when observing with a telescope during the day? Reason: Only when you look at the sky or indoor walls will you see a vast expanse of white. Solution: Lower the telescope tube and aim it at the ground, buildings, trees, etc. Why do we see a everything dark when observing stars at night? Why do we see a everything dark when observing stars at night? Reason: Not aiming at a bright target, such as stars or the moon Solution: Determine the target before observation, and do not aim at a "dark" empty area at will Why can the finderscope see but the telescope lens cannot? Asynchronous reason: The finderscope and telescope len are not aligned synchronously. Solution: Find a target from the telescope lens, adjust the finderscope to align it with the center of the target, and complete the synchronization calibration.