There is no reason why you can't go with a 6" Newt with the tripod legs fully retracted. you just slacken the tube ring knobs and rotate the tube to a comfortable viewing position
once you have lined up on your target. You just have to stop the scope sliding
downward while the tube rings are slackened off. You can easily make or buy a ring which fits round the scope, but is not attached to the mount, and which remains tight, and stops the scope sliding.
The Meade you showed us is much too slow for astrophotography on anything
other than the moon or the planets, and has too narrow a field of view to
enable imaging the entirety of almost all DSOs.
raymo
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