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If you observe regularly in an environment with high levels of dew, and extraneous amounts of stray light which you cant control - like street lights, advertisement signs and neighbors. Consider the solid tube. It will naturally reduce these 2 factors affecting effective observations easily.
If you like to travel to dark sky sites as well as observe from home. Consider the truss design for ease of transportation and invest in a shroud to reduce the stray light problem.
If you feel you are being deliberately persecuted with unneeded lighting like flood lights, street lights, near by sports fields and annoying neighbors. Consider investing in an airsoft rifle.
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