Low light acquisition script for old picamera (raspistill, etc.)

low_light_acquisition.py

import argparse
import logging
import time

import picamera

from fractions import Fraction

EQUILIBRATION_SECONDS = 10

argparser = argparse.ArgumentParser()
argparser.add_argument(
    "--exposure",
    "-e",
    type=int,
    help="Exposure time in seconds (max 16)",
    default=4,
)

argparser.add_argument(
    "--iso",
    "-i",
    type=int,
    help="ISO value (max 800)",
    default=100,
)

argparser.add_argument(
    "output",
    type=str,
    help="Output file",
)

args = argparser.parse_args()
exposure_seconds = args.exposure
output_file = args.output
iso = args.iso

logging.info("Equilibrating camera for %s seconds", EQUILIBRATION_SECONDS)
p = picamera.PiCamera(framerate=Fraction(1, exposure_seconds))
p.shutter_speed = exposure_seconds * 1000000
p.iso = iso  # max 800
time.sleep(EQUILIBRATION_SECONDS)
p.exposure_mode = "off"

logging.info("Capturing for %s seconds", exposure_seconds)
p.capture(output_file)

p.close()
logging.info("Done")