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Thermal dynamics
All materials expand and contract at different rates due to internal and external temperatures.
My carbon newts hold collimation much better than my old metal tube and truss newts but still require re collimation throughout the year due to temperatures fluctuating throughout summer and winter. My 12” is worse than the 10” and the 10” is worse than the 8”.
Some folk around the globe would experience huge fluctuations in temperature between summer and winter.
For visual work a fixed scope at say 1000 to 1200mm fl probably wouldn’t affect your view to greatly, but for imaging it can and does.
Collimating that 6” Dob should be easy and completed in a minute or two , not that big of a deal.
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