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Hi Raymo,
My scope is a Bintel GSO 6” f6 Newtonian reflector ( stock no mods )
I have been imaging since February at prime focus with focuser racked fully in to achieve good star focus. I only noticed the other night that the focuser (Crayford dual speed ) had to be tweaked out a bit ( probably not half a turn but maybe quarter to eight turn ) to achieve focus. It was noticeable because I haven’t imaged in cold weather yet.We have had cloudy wet conditions in Sydney since end of May. I have not changed anything in my kit at all.
When you do things methodically every time you set and image you do notice any change ( even slight changes )
Martin
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