This is my adaption of the Allsky camera from Thomas Jacquin - https://www.instructables.com/Wireless-All-Sky-Camera/

In order to allow remote focus of the lens, I used a servo driven by the PI 4.

These 3D prints work with

• the RPi HD camera on which the servo mount is screwed in
• a micro servo Tactic TSX10 - https://makeitbuildit.co.uk/products/tactic-tsx10-micro-servo-digital-hi-torq-metal-gear-1bb . The 3D servo mount should work with any servo of a size 12mmx24mm
• a C mount adaptor for the lens on which the lens horn will fit and allow to rotate the lens.
• a fisheye lens. in my case I used this cctv fisheye lens: https://www.ebay.com/itm/374780361015

The servo is connected on PINs

• 2: 5V (red)
• 9: Ground (black)
• 12: GPIO 18 (servo command - white)

I used some python code on the PI4 to operate the servo (which displays a simple slider that goes from -90 to +90)

from gpiozero.pins.pigpio import PiGPIOFactory
from gpiozero import AngularServo
from guizero import App, Slider, Text

 

factory = PiGPIOFactory()
servo = AngularServo(18, min_pulse_width=0.0010, max_pulse_width=0.0022, pin_factory=factory)
angle_base = 0

 

def slider_changed(angle):
servo.angle=int(angle)

 

app = App(title='Servo Angle', width=300, height=150)
slider = Slider(app, start=-90,end=90,command=slider_changed, width=300,height=50)
slider.text_size = 30

 

app.display()

Note that to execute this code, you first need to run

sudo pigpiod

Some trial and error is needed to tune the min_pulse_width and max_pulse_width values and matching start and end values to your specific servo so that you get the correct angular motions.