The summer brings ths turbulence more often than winter. The ground heats up during the day and emits heat back into the atmosphere at night - these rising heat currents can produce they wobbly probems your hqving and no filter is going to eliminate it. Your best summer strategy is to start very late after the ground has lost its stored heat - like after mid-night. That will mitigate it somewhat. Avoid aiming your scope across heat sources, like house roofs, etc.
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