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Frequent Contributor
Posts: 33
Registered: ‎03-12-2019

DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras

[ Edited ]

The heat from a Canon LP-E6N battery interferes with the sensor during minutes- to hours-long exposures, its thermal radiation causing ill-effects which ruin photographs of deep-space objects.  I’ve encountered this following exposure in as little as 8 minutes, and durations as long as 4.3 hours: I’ve eliminated all sources of light as the cause [producing identical results from taking photos inside a dark, cold (20°F) closet, lens cap on, an opaque black bag over the camera and lens, with exposures of as little as 10 minutes duration].

 

I observed a professional astronomer utilize a brand-x camera while taking long-duration astrophotographs of deep-space objects, using an external DC-power source to power his camera in place of the normal internal (lithium ion) camera battery: the battery is much like Canon’s DC Coupler DR-E6 and AC-E6N AC Adapter — except that instead of using an AC power source, the battery connected to another battery through a USB port, providing DC-to-DC power.

 

Using Canon’s DR-E6 and AC-E6N, while photographing at high altitude and sub-zero ambient temperatures, I’ll be forced to connect to an external AC source such as a generator or a large battery: (1) I will lose significant power utilizing a lithium battery at low temps; (2) I will lose 30-40% power converting the large lithium battery DC-to-AC using an inverter; then (3) I will lose another 40% of the power converting AC-to-DC through the use of the transformer-rectifier. My source of power must be available for 4-5 hours to power the camera for long-duration exposures, or taking hundreds of photos (each 5+ minutes’ duration): temperature-affected poor battery performance and connection losses make that questionable, perhaps impossible.

 

Most small generators will not provide AC power for that long a period at altitudes in excess of 12,000’ without refueling (neither gasoline or propane-powered generators have a 4-5 hour endurance); and the power provided by many small generators at high altitude is much too inconsistent for use with electronics without adverse signal-to-noise ratios. Larger inverter generators have ample gas tanks and clean power, but they weigh nearly 100 pounds and are not easily transported over rough terrain.

 

I’m left with the option of looking for an after-market battery for use in my EOS 6D or 6D Mk II, one that connects to a DC power source through a USB cable. Does anyone know of such a DC-to-DC battery compatible with the 6D/6D Mk II?

 

 

Chris P. Bacon
F-1; AE-1; EOS 1V, 6D, 6D Mk II, 7D, and 7D Mk II.
Esteemed Contributor
Posts: 3,174
Registered: ‎02-17-2016

Re: DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras

If it is indeed thermal radiation, you can try wrapping it in aluminum foil to reduce its emissivity.

Frequent Contributor
Posts: 33
Registered: ‎03-12-2019

Re: DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras

It’s a thought, but in my experience, nothing catastrophic has ever happened putting metallic foil in tight spaces in close proximity to vital electrical contacts.  Yanno?  Except when I do it...

 

The one variable I haven’t explored is whether a Canon battery grip would cause this same effect on the sensor platform.  No one knows.

 

 

Chris P. Bacon
F-1; AE-1; EOS 1V, 6D, 6D Mk II, 7D, and 7D Mk II.
Frequent Contributor
Posts: 61
Registered: ‎11-14-2018

Re: DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras


@ChrisPBacon wrote:

 

The one variable I haven’t explored is whether a Canon battery grip would cause this same effect on the sensor platform.  No one knows.

 

 


A battery grip might work for you as the batteries are further removed form the camera.  The way the grip works is it switches between the two batteries but don't know if it would do that during a long exposure.

Frequent Contributor
Posts: 61
Registered: ‎11-14-2018

Re: DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras

[ Edited ]

BTW another solution might be modifying a car LP-E6N charger to power the camera.  I havent thought a lot about it but there may also be a way to use remote batteries to provide the 7.2 volts provided by the LP-E6N.  I know the camera is picky about what is in the battery slot, but a mod of a AC power adapter might be possable.

 

Also there is a "

Lanparte D-Tap to LP-E6 Fixed Voltage Battery Pack for Select Canon Cameras

Avaible through Adorama that may be usefull.  There is also a 

LP-E6 Dummy Battery - ACK-E6 AC Power Adapter E6 Adapter 

available from Amazon that can be powered from a USB power bank, 

Frequent Contributor
Posts: 33
Registered: ‎03-12-2019

Re: DC-powered source (USB connection) E6 battery for use with EOS 6D and 6D Mk II cameras

Thank you for the suggestion.

 

I asked someone about using a splice into an existing piece of Canon DC gear: a splice will decrease line voltage and increase resistance (minimal in a low-voltage system, but still, it’s there). Soldering it will decrease the effects, but it will still change performance.

 

I’m very reluctant to risk cumulative damage to the camera’s electronics, or to do something that might introduce unwanted noise into the collected data stream. In the latter case, it’s difficult to obtain the photos with a lot of expense and hard work involved: nothing is worse than finding out that everything you did was worthless.

 

Still looking.

Chris P. Bacon
F-1; AE-1; EOS 1V, 6D, 6D Mk II, 7D, and 7D Mk II.
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