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Valmir,
Cool down - some scopes exhibit bad (distorted) seeing until the air in their tube reaches the same temperature as its surrounds. Dobs are particularily good as are refractors - SCT and particularily MAKs suffer alot more. A DOB is set up and use - in under 5 minutes air currents die won - viewing is fine. A MAK design may take 25 - 30 minutes to cool down to thermal equilibrium and hit optimal seeing.
If you set up before sun down - and re-visit once its truly dark - should be okay.
To me mount is more important than optics!
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