david_marat Posted April 4, 2008 Share Posted April 4, 2008 I found some info stating that when using Canon Battery Pack attached directly to EOS DIGITAL camera, images may contain noise due to electromagnetic interference. May a battery grip (on 40D) resolve the problem? Any experience? Thanks, David Link to comment Share on other sites More sharing options...
Charles_Webster Posted April 4, 2008 Share Posted April 4, 2008 Can you cite the source of that info, please? <Chas> Link to comment Share on other sites More sharing options...
david_marat Posted April 4, 2008 Author Share Posted April 4, 2008 As I remember the original source was the battery pack's manual. David Link to comment Share on other sites More sharing options...
jason_hall4 Posted April 4, 2008 Share Posted April 4, 2008 EMI requires magnetic fields to move and fluctuate thus induceing voltage in place it should not be. That is normally not a function of a DC power supply. So I don't know if this is a valid claim. On top of that the battery pack is made to power a flash not the camera. The battery grip powers the camera not the flash. So no a battery grip will not replace a CP-E4 battery pack. Jason Link to comment Share on other sites More sharing options...
jimstrutz Posted April 4, 2008 Share Posted April 4, 2008 There have been some complaints on forums about it too. Usually happens with certain cameras when using high ISO. Not sure about the 40D though. I haven't had any issues with my 40D, 550EX and CP-E3 up to 800 ISO. I seldom go higher with flash. Link to comment Share on other sites More sharing options...
jason_hall4 Posted April 4, 2008 Share Posted April 4, 2008 The EMI must be coming from the flash due to the faster cycle rates. Ineresting. Jason Link to comment Share on other sites More sharing options...
david_marat Posted April 4, 2008 Author Share Posted April 4, 2008 Ok, this is what I found on the Canon CP-E4 battery pack's manual at retail store: "When using an EOS DIGITAL camera with the Compact Battery Pack CP-E4, images may contain noise due to electromagnetic interference. Therefore, be sure to keep the battery pack at least 5 cm/2 inches away from the camera body. Also, do not directly attach the Compact Battery Pack CP-E4 to the tripod socket on an EOS DIGITAL camera other than as EOS-1D series camera. When using an EOS DIGITAL camera other than as EOS-1D series Camera, attach an optional battery grip to the camera's tripod socket, then attach the Compact Battery Pack CP-E4 to the tripod socket on the battery grip." Well, I new that a distance between a camera body and the batery pack matters swomehow and now it is clear somehow. That's why I mentioned about a battery grip - increasing the distance. Anyway, this is just theory. I wander how it works in the field. David Link to comment Share on other sites More sharing options...
r.rajamani Posted April 4, 2008 Share Posted April 4, 2008 Coming to think of this, there might be some explanation. My shot at it is as follows - The output of the CP-E3/E4 is to the order of 300V to 320V in order to do a rapid charge of the flash. The 8 cells it holds internally would only amount to 12V DC and this has to be stepped up (i.e. inverted) using a circuit. This inverter circuit has an oscillator which generates AC as output (which may or may not be converted to DC) before it feeds the flash. It is this oscillator that is the most likely cause of EMI/EMC which can affect the performance of the digital camera. Coming back to the original poster, the CPE3/4 powers only the flash and not the camera. The OP says 'attached'. It cannot be attached to the camera electrically, if placed next to the camera, then maybe it might affect if the camera is not adequately shielded against electrical noise, which is likely in the case of plastic bodies. Metal camera bodies would be less susceptible. Link to comment Share on other sites More sharing options...
lee_smith2 Posted April 5, 2008 Share Posted April 5, 2008 Hi David, The 5D is sensitive to EMI. I have a Quantum Compact that I used to attach to the underside of the camera to power a 580EX and I got a lot of banding. After I moved it off the camera to the flash bracket, the problem cleared up. The Quantum site posts a warning only for the 5D. Lee Smith Link to comment Share on other sites More sharing options...
jason_hall4 Posted April 5, 2008 Share Posted April 5, 2008 I did not realize that the pack steped up the voltage from the 12v. That being the case it make perfect sense that is causes EMI. Learn something new every day. Glade I know now, I may get one of these suckers. Jason Link to comment Share on other sites More sharing options...
greg_tan Posted April 5, 2008 Share Posted April 5, 2008 I have 2 CPE3 packs. It's best to attach it to your belt loop. The screw to attach to the tripod hole on the camera doesn't work very well, and the pack sticks out on both sides making it cumbersome. Link to comment Share on other sites More sharing options...
ejder Posted May 19, 2010 Share Posted May 19, 2010 <p>I am so glad to have found this post (2 years later): I am running into the exact same issue with my Yongnuo battery packs for my Canon 580EX flashes. If there is such a warning for Canon battery packs, then I am certain it's not an "issue" with the Yongnuo packs but just a trait of all of them. Thank you!</p> Link to comment Share on other sites More sharing options...
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