[BUG] LensPosition must be set to 4 in manual focus for "Infinity"

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python, raspberry-pi
Domain
embedded-iot

Research direction

Start by reproducing the reported behavior with the supplied Python test program on a Raspberry Pi Zero 2 W with the Raspberry camera v3, and inspect the reported LensPosition metadata for manual focus values. Done means the manual-focus setting and the documented or observed infinity position agree, with the behavior verified across the relevant lens-position range.

Written by the indexing model from the issue text.

Description

The manual focus is not "Infinity" when LensPosition is set to 0.0.
With LensPosition between 0 and 3, the horizon is blurred, it is clear when LensPosition = 4

My hardware is : Raspberry Pi Zero 2 W + Raspberry camera v3 (wide 120°)

Here is the test program:

import libcamera
import time
from picamera2 import Picamera2
picam2 = Picamera2()
picam2.configure(picam2.create_still_configuration())
picam2.start()

for lens_position in range(35):
    picam2.set_controls({"AfMode": libcamera.controls.AfModeEnum.Manual, "LensPosition": lens_position})
    time.sleep(1)
    r = picam2.capture_request()
    filename = "lens-position" + str(lens_position) + ".jpg"
    metadata = r.get_metadata()
    actual_lens_position = metadata["LensPosition"]
    print("Actual LensPosition = {}, file capture in file {}".format(actual_lens_position,filename))
    r.save("main", filename)
    r.release()

picam2.stop()
Dominant language
Python
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