GPhoto2 Python Bulb Exposure Example

take_image.py

#!/usr/bin/env python

import gphoto2 as gp
import os
import sys
from time import time, sleep

EXPOSURE_LENGTH = 10
ISO = '100'


def take_image():
    context = gp.Context()
    camera = gp.Camera()
    camera.init()
    config = camera.get_config()

    cameramode = config.get_child_by_name('autoexposuremode').get_value()
    if cameramode != 'Manual':
        print("Cannot take bulb exposure if camera not in Manual ('M') mode.")
        return -1

    updated_config = False
    shutterspeed = config.get_child_by_name('shutterspeed')
    if shutterspeed.get_value() != 'bulb':
        shutterspeed.set_value('bulb')
        updated_config = True

    iso = config.get_child_by_name('iso')
    if iso.get_value() != ISO:
        iso.set_value(ISO)
        updated_config = True

    if updated_config: camera.set_config(config)

    print(f"Camera Mode is {cameramode}")
    print(f"Shutterspeed is {shutterspeed.get_value()}")
    print(f"ISO is {iso.get_value()}")
    print(f"Exposure Length is {EXPOSURE_LENGTH}s")
    print("Capture Image")

    t = time()
    bulb = config.get_child_by_name('eosremoterelease')
    bulb.set_value('Immediate')
    camera.set_config(config)
    sleep(EXPOSURE_LENGTH)
    bulb.set_value('Release Full')
    camera.set_config(config)

    file_added = False
    capture_complete = False
    timeout = False
    folder = None
    file = None
    while (not file_added or not capture_complete) and not timeout:
        typ, data = camera.wait_for_event(3000)
        if typ == gp.GP_EVENT_FILE_ADDED:
            print(f'File Exists On Camera {data.folder}{data.name}')
            file_added = True
            folder = data.folder
            file = data.name
        if typ == gp.GP_EVENT_CAPTURE_COMPLETE:
            print('Capture Complete!')
            capture_complete = True
        if typ == gp.GP_EVENT_TIMEOUT:
            print("Timeout waiting for image")
            timeout = True
            continue

    f = camera.file_get(folder, file, gp.GP_FILE_TYPE_NORMAL, context)
    t2 = time()
    print(f"Elapsed time {t2-t}s")
    target_path = os.path.join(os.getcwd(), file)
    f.save(target_path)
    print("Cleaning up file on camera")
    camera.file_delete(folder, file)
    return 0


if __name__ == '__main__':
    sys.exit(take_image())