USB Dropouts when shooting tethered

NFGphoto

• 2014年12月08日 01:16

I've got an issue where shooting tethered will stop working during a session and require a PC reboot to resume working.

This happened with both Win7 and Win8.1, both a Nikon D700 and D800, on two different machines, two different cables (USB2, USB3) and two versions of C1 (V7 and V8).

Once it happens, C1 simply doesn't respond to anything the camera does. It's frustrating, and sort of impacts my professional appearance in the studio when someone's hanging upside down and I tell them "oops, sorry, it's happened again, gimme a minute..."

Has anyone else experienced this? Have you found a cure?

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  Drew Altdo

  • 2014年12月08日 09:54

  If you need to reboot the system, then the issue is likely not software level but system level.
  It may be that the OS is dropping the port or USB driver and rebooting is the only way to get those back up and running.
  
  We have seen this with lower end USB cards in PC's where the power output to USB is not adequate. The camera and subsequent driver pulls too much power to facilitate connection, and the system shuts down the port to prioritize power management. Rebooting is then the only solution to get the port back online. That may be what is happening here but it's hard to say.
  As Capture One does not control the driver, it's difficult to assist in system related matters. A solution may be a different card or externally powered USB hub.

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  NFGphoto

  • 2014年12月23日 07:57

  I'll do some more testing and see if it's a reboot that's required or a restart of the software.
  
  Given that the USB3 spec allows for some serious power draw I'd be surprised if this was the case, especially since, as mentioned, we're talking about two different cameras, computers and operating systems. The common denominator is C1 (and, I guess, Nikon).
  
  But! Science will tell us. I'll report back when I work it out.

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  SFA

  • 2014年12月23日 09:02

  [quote="NFG" wrote:
  I'll do some more testing and see if it's a reboot that's required or a restart of the software.
  
  Given that the USB3 spec allows for some serious power draw I'd be surprised if this was the case, especially since, as mentioned, we're talking about two different cameras, computers and operating systems. The common denominator is C1 (and, I guess, Nikon).
  
  But! Science will tell us. I'll report back when I work it out.

  
  
  FWIW I have found USB3 to be less then reliable in some situations just running a self powered external disk drive.
  
  The drives have a "power saver" setting. Using the supplied, quite short, cable everything work fine. They will recover form low power mode after a few seconds.
  
  Using a 3mtr cable ... sometimes they work, sometimes not. Sometimes they come up at USB2 speeds. When they are not recognised by USB3 if I switch the cable to a USB3 port it almost invariably wakes them up and they will work at USB2 speeds. I can even swap the cable back to a USB3 port and they will still be recognised though at USB2 speed.
  
  I bought a 2mtr cable and that seems to work fine.
  
  This is using a top end (albeit now 2 years old) Dell Precision Mobile Workstation with 2 USB3 ports one of which is apparently the Hi-Power variant. It doesn't appear to make any difference. One assumes the port specs were probably the highest available at the time.
  
  So, nothing conclusively useful I'm afraid but I am very cautious about reading much into the claims for USB3 based on my experiences and those of Mac users in the sister forum.
  
  Grant

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