Canon camera heats up when "open", but doing nothing

[pootle]

Using a Canon EOS R camera, if I just open the camera and get config, then sit in a very slow wait for event loop, the camera heats up (and uses a lot of battery power!). When I finally take a photo, the camera reports a temperature anything up to 50 Centigrade,

If I actually take photos with long exposures in bulb mode (say 1 minute) the camera slowly cools down again. It looks like whatever gphoto2 does to keep the camera from going to sleep, keeps the camera processor too busy - even busier than when taking a photo (or at least when collecting photons).

Is there a way to hold the camera open, but inactive so it doesn't heat up (heating up seriously increases noise on long exposure photos).

I'm using Jim Easterbrook's python binding.

python-gphoto2 version: 2.3.3
libgphoto2 version: ['2.5.27', 'standard camlibs', 'gcc', 'ltdl', 'EXIF']
libgphoto2_port version: ['0.12.0', 'iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi', 'gcc', 'ltdl', 'EXIF', 'USB', 'serial without locking']

Here is the program:

#!/usr/bin/env python

import gphoto2 as gp, logging, sys, time

# test 1 - does the camera stay active once opened by gphoto2


def opencamera():
    acamera=gp.Camera()
    try:
        acamera.init()
    except gp.GPhoto2Error as gpe:
        if gpe.code != -105:
             logger.warning('error -105, camera sulking?')
        return None, None
    try:
        gp2cam_cfg=acamera.get_config()
    except gp.GPhoto2Error as gpe:
        if gpe.code != -105: # Something nasty and unexpected!
            raise
    return acamera, gp2cam_cfg

ll = logging.DEBUG
rl = logging.DEBUG
logger = logging.getLogger()
logger.setLevel(ll)
ch = logging.StreamHandler()    
ch.setLevel(rl)
ch.setFormatter(logging.Formatter('%(asctime)s - %(module)s %(name)s - %(levelname)s - %(message)s\n',  datefmt='%H:%M:%S'))
logger.addHandler(ch)
logger.warning('logging level is %s, reporting level is %s' % (ll, rl))

try:
    gp2cam, cfg = opencamera()
    while gp2cam is None:
        gp2cam, cfg = opencamera()
except KeyboardInterrupt:
    logger.warning('break! - byee')
    if gp2cam:
        gp2cam.exit()
    sys.exit(0)

started = time.time()
reportat = started+10
try:
    while True:
        try:
            etype, data = gp2cam.wait_for_event(100000)
        except gp.GPhoto2Error:   #  for example [-52] Could not find the requested device on the USB port
            etype = None
        if etype == gp.GP_EVENT_TIMEOUT:
            pass
        elif etype == gp.GP_EVENT_FILE_ADDED:
                            print('FILE ADDED')
        elif etype == gp.GP_EVENT_UNKNOWN:
            print('EVENT_UNKNOWN', etype, data)
            print(type(data).__name__)
        elif etype == gp.GP_EVENT_CAPTURE_COMPLETE:
                            print('CAPTURE COMPLETE')
        elif not etype is None:
            print('EVENT-----', etype, data)
        if time.time() > reportat:
            logger.info('time passed')
            reportat += 10
        
except KeyboardInterrupt:
    if gp2cam:
        gp2cam.close()
    sys.exit(0)