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Hello,
If you were viewing Venus, had the scope been given time to acclimate?
Were you viewing from a balcony? Or carpark? Ie, a large warm slab of concrete? Looking over heated concrete buildings etc? All these things will make atmospheric heatwaves which can reduce seeing dramatically.
I have no idea on a mak, I do know they take longer to acclimate due to being a close tube. If your out around sunset the temperature may be dropping to quickly to get the scope acclimated.
Steve
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