Do you keep zooming in until you reach just before the sharpest point? The Feather Touch microfocus upgrade FTF1575PA-DS from Starlight is an upgrade that offers fine adjustment in addition to normal focusing.
In addition to the normal focus adjustment, you get a mechanism that allows you to rotate the focus point in very small increments. Such an upgrade is part of a certain type of telescope or focus system, so check the type number to see if it fits your telescope. You can find more parts here. Single focusers and parts.
A good adjustment is especially useful for planets and double stars and for photography, where the focal point is narrow. If you are unsure, please send us a photo of your focuser and the brand and type of telescope you use. You can read about which eyepieces you use for high magnification in ocular explained.
For Tele Vue refractors, there is a ready-made solution. micro pinion fine focus with brake, and for the Takahashi 2.7 inch focuser a separate micro pinion fine focus.
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