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Hi Peter.
You should check the collimation each time the scope is moved. Ususally will only need tweaking, but if it is the Bintel brand, the springs on them are not really very strong, so it can easily move.
You should remember taht the higher power EPs are intrinsically harder to focus and need better conditions, especially with bright targets like planets, to give the best views. I have a 10mm Ethos, which is a beautiful EP, but only rarely can I get pinsharp focus with it.
Malcolm
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