This site contains a few tips to make astronomical instruments and to
watch the sky both night and day, at a low cost.
The equatorial table : take pictures of the nightsky without a telescope
The hydraulic focusing system : focus the image without vibration
Stepper motor electronic controls : pilot a 6 wire motor
Hydraulic drive : use a stepper motor and syringes to drive your equatorial table
Some advice to build a telescope : take up the challenge