Announcement

Collapse
No announcement yet.

Pocket 4k Power assignment advice needed

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Pocket 4k Power assignment advice needed

    Hey all!

    So I want to power the BMP4k via the cameras 12v side port (with a battery in the camera to ensure no power disruption if needing to switch rigs)
    I also want to power the BM Ursa Mini EVF (12v) and a HDMI to SDI converter (5v)

    all from this Fotga pinch...

    https://www.amazon.com/DP500III-Unin...r=8-4-fkmrnull

    It has 1x 14.8v Lemo, 1x 5v USB, 1x 5v DC, 1x 12v DC, 1x 8v DC ports
    The EVF needs the 12v port (I believe) and I have 2 options to power the HDMI to SDI (5v) converter but what would then be the best way to power the camera through the side port?
    Would the 8v (5A) be enough (I know it is via Dummy Battery but I can't find that info re: this 12v port) and/or would the 14.8v LEMO be too much ? (if so would the 14.8v also be too much for the EVF?)

    Any advice would be greatly appreciated.
    Attached Files

  • #2
    Hey! I`m following this thread. I have the pocket 4k and the ursa viewfinder as well. Are you using the wooden camera mod for the viewfinder?

    Comment


    • #3
      For the EVF, provide only 12V 5%

      14.8V into the 12V input of the Pocket Cinema Camera 4K is OK.

      Comment


      • #4
        V-Mount for the BMPCC4K:

        https://www.bhphotovideo.com/c/product/1449166-REG

        D-Tap to 5v USB with D-Tap pass through:

        https://www.bhphotovideo.com/c/product/1188613-REG

        Comment


        • #5
          Originally posted by ther00ts1983 View Post
          Hey! I`m following this thread. I have the pocket 4k and the ursa viewfinder as well. Are you using the wooden camera mod for the viewfinder?
          No I am not... I am actually waiting for my BMP4k to arrive (should be today or tomorrow) but I think I have figured out a way to mount it on the Ttla cage which "should" work.
          The Wooden Camera mod is no longer in production and seemingly no one has them... Also it is quite expensive and you have to completely dissect your viewfinder and the only advantage it gives you is a different way to mount it...
          In our case we would still need to convert the HDMI to SDI which means we still need another device and ways to power both devices... So while the Mod at first seemed like the way I wanted to go (again if it were available) I am now going to try to make it work with it's existing form factor.

          Comment


          • #6
            Originally posted by Kristian Lam View Post
            For the EVF, provide only 12V 5%

            14.8V into the 12V input of the Pocket Cinema Camera 4K is OK.
            Thanks for the reply Kristian! So you think that 14.8v will still be "safe" for the power port on the side?
            The pinch I have also has an 8v which I won't be using... would that be "enough" for the camera to the side port?

            What I don't want to do is create one of these dreaded "electrical loops" that I have been reading about where some people have been shorting out their HDMI ports by powering their monitors and camera from the same power source (unregulated power source)

            Comment


            • #7
              Originally posted by terraform View Post
              No I am not... I am actually waiting for my BMP4k to arrive (should be today or tomorrow) but I think I have figured out a way to mount it on the Ttla cage which "should" work.
              The Wooden Camera mod is no longer in production and seemingly no one has them... Also it is quite expensive and you have to completely dissect your viewfinder and the only advantage it gives you is a different way to mount it...
              In our case we would still need to convert the HDMI to SDI which means we still need another device and ways to power both devices... So while the Mod at first seemed like the way I wanted to go (again if it were available) I am now going to try to make it work with it's existing form factor.
              Yup. There are ways of mounting the viewfinder on top of the cage. I have the SmallRig full cage.

              Comment


              • #8
                Originally posted by ther00ts1983 View Post
                Yup. There are ways of mounting the viewfinder on top of the cage. I have the SmallRig full cage.
                Do you happen to have any photos of your setup? I am curious how you have solved this issue.

                Comment


                • #9
                  Originally posted by terraform View Post
                  Thanks for the reply Kristian! So you think that 14.8v will still be "safe" for the power port on the side?
                  The pinch I have also has an 8v which I won't be using... would that be "enough" for the camera to the side port?
                  No, 8V will not be enough for the side port. If the 8V output is regulated, then your option is to remove the battery door and go in via a dummy LP-E6 battery using the battery slot.

                  Comment


                  • #10
                    This is just an example. I would rather use my external monitor, but this is doable. Power the camera and viewfinder by d-tap on the battery and battery plate and the converter by usb (on the other side of my battery). IMG_5043.jpgIMG_5036.jpgIMG_0586.jpgIMG_5421.jpg
                    Originally posted by terraform View Post
                    Do you happen to have any photos of your setup? I am curious how you have solved this issue.

                    Comment


                    • #11
                      Originally posted by terraform View Post
                      Thanks for the reply Kristian! So you think that 14.8v will still be "safe" for the power port on the side?
                      The pinch I have also has an 8v which I won't be using... would that be "enough" for the camera to the side port?

                      What I don't want to do is create one of these dreaded "electrical loops" that I have been reading about where some people have been shorting out their HDMI ports by powering their monitors and camera from the same power source (unregulated power source)
                      The power input is rated from 12-20v. You're more than safe with 14v. In fact I use the Indipro power pod and it runs 14.4 volts.

                      Scroll down to power requirements.
                      https://www.blackmagicdesign.com/pro...specs/W-CIN-12

                      Comment


                      • #12
                        Thanks for sharing @ther00ts1983 ... so out of curiosity what is the voltage of your D-Tap, is it regulated and I am assuming you haven't had any issues this way? I would have assumed the D-Tap would have given too much juice to power the EFF?

                        Thanks for the info and link @Park Edwards
                        Last edited by terraform; 05-03-2019, 11:45 AM.

                        Comment


                        • #13
                          In this video he claims the Wooden Camera modification for the EVF accepts 12v-20v



                          https://youtu.be/8U5DOamUHkM

                          Comment


                          • #14
                            Originally posted by Bob Loblaw View Post
                            In this video he claims the Wooden Camera modification for the EVF accepts 12v-20v
                            That is some great info @Bob Loblaw and that definitely opens up some options for port assignment... I am glad I started this conversation here as it has been very enlighten.

                            Comment


                            • #15
                              Yes, but the Mod box may have a small voltage regulator inside it to drop 14-20 VDC back to 12VDC for the EVF.
                              Kristan Lam did say 12VDC +/- 5% (.5 VDC) power requirement for the EVF. The front power plug on the Ursa Mini is 12VDC regulated, which is where the EVF normally is powered from.

                              That said, I have the Wooden Camera EVF mod, and have used the DTap to power the EVF without issues. But again, the expansion box attached to the EVF when the BM Mount is removed, may have a voltage regulator in side, I did not open mine up to look.
                              Cheers
                              Last edited by Denny Smith; 05-09-2019, 05:50 PM.

                              Comment

                              Working...
                              X