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I plan to use my Canon 50D in a studio, tethered to a PC.

It would be great if it drew the power it needed from the USB bus rather than from the battery, so I wouldn't need to worry about changing batteries (and moving the camera) during the shoot.

Can anyone please tell me if the Canon 50D will (or can be made to) draw power through the USB port?

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3 Answers 3

up vote 13 down vote accepted

Based on the reading of the battery spec, no. The battery pack supplies 7.4v, while USB can only supply 5v. However, you can buy the ACK-E2 wall power kit to power the camera directly from a standard outlet.

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Are there any commercial adapters for charging from 12V? I would use it for astronomy to charge camera from powertank.(teleskop-express.de/shop/product_info.php/info/…) –  Pavle Gartner Jul 15 at 12:48

An USB 2.0 port can only supply at most 500 mA of power, and that is simply not enough to run a camera on.

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I thought it was up to 1A ? –  Rowland Shaw Nov 18 '10 at 8:50
2  
For USB 2.0 the limit is 500mA and for USB 3.0 the limit is 900mA –  labnut Nov 18 '10 at 9:11
3  
do you have any specs or references for what the Canon, or any DSLR, needs? I would have thought 0.5A @ 5V would be enough to drive the mirror and sensor - maybe not the built-in flash. Maybe I haven't got a good feel for it though. –  Oddthinking Nov 19 '10 at 8:14

The Mini USB won't give you any power to or for the camera.

But when you have it hooked up, the camera's battery is used up much faster.

Three answers: 1. Canon ACK-E2 (Fake battery adapter). $60.00, but you have a cord. 2. Canon vertical grip. $300 and about a pound of weight 3. ATG AK1 Un-Tethered Systems. $500, very light. Image/Live-View/flash-wirelessly with many cameras!

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I ordered a cheap knock-off to the Canon ACK-E2 when I saw the first responses. Arrived before my photo-shoot, and once all the plugs and cables where duct-taped together to stop them falling out, it solved the problem perfectly. –  Oddthinking Dec 27 '10 at 12:47
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The "ATG AK1" is a questionable product: photo.net/canon-eos-digital-camera-forum/00XQ5w So far there is no proof that it actually exists. –  Jay Lance Photography Jan 31 '11 at 16:34
    
How much did you get that Canon ACK-E2 and from what site? –  zesix Jan 31 '11 at 16:38

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