Stepper motor recommendation for robot arm

Hello,

I am planning to make a 5 axis robot-arm, and I need recommendations on what stepper motor I should buy.

It needs to be precise because I will use image recognition with OpenCV to control it. I also need something not very expensive.

Thanks in advance.

"precise" and "not very expensive" are mutually incompatible options.

The joints and gearing are far more important for precision and accuracy than the motors.

Unfortunately you have given no useful information for choosing a motor.

Torque, speed, power, resolution...

The word "precise" is not a number, it could mean anything.

A diagram of the proposed robot arm showing where the motors will be located and how their output shafts will be connected would also be useful.

...R
Stepper Motor Basics