New to this forum.
I have 7D and have tried to do some star trails but I find that the maximum time the camera will operate with an open shutter is seven mins plus minus seconds.
Settings: bulb, widest aperture and using remote control TC80N3 locking the on switch. Tried using long setting but my remote controller battery is flat so thought ok to manually control the time. If I go over the seven mins, say 8 mins, then at the end of this time when I turn the switch off on the remote controller the camera's red light on the bottom RH side remains on as if it's still processing the information. I have tried waiting but this seems to be an infinite period I could wait. Tried turning off the camera but it will not allow me. So the only thing I found to do was open the camera's battery compartment which of course deletes the last image.
Perhaps I'm doing something wrong. I will appreciate any advise on this matter.
I'm currently traveling remote areas and unable to quickly purchase a new battery.
Looking forward to hearing from you.