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Smaller scopes like an 8" dob are much more tolerant simply because the components that are likely to move are much lighter (eg the primary mirror) so are held in place more easily. Also usually they are f6 which makes it a more tolerant scope anyway.
Still I think regular collimation is a good habit to get into, once learnt it is very quick and painless and if aperture fever hits and a bigger scope arrives it will be second nature.
Malcolm
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