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Archive 2012 · 500mm f/4, balance problems with D7000 on Gimbal
  
 
birdied
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p.1 #1 · p.1 #1 · 500mm f/4, balance problems with D7000 on Gimbal


First let me start with apology about long post.


I have the following:
D7000
D300
Jobu Jr3 Gimbal
Induro CT213 Tripod
300mm f/4 ( gimbal and tripod work wonderfully with the above)
I just purchased the 500mm f/4 VR.
After research and information from Jobu, I thought the Jr3 Gimbal would be sufficient .
My problem is balance . I can not get the gimbal to balance with the D7000 and 500mm. I can get the D300 to balance, if I put on the SB900, but it is so far back on the foot , forward swing motion is limited.
I even purchased the replacement foot plate Jobu recommended for 500mm lens and lighter cameras for use with the JR3

Jobu foot

I sent Jobu email and this is a part of the reply:
Quote
Thank you for your email. The balance on any large lens (500F4 or 600F4) can
be challenging to achieve when using a very light camera body. This is
irrespective of gimbal manufacturer, they all balance the same way. So
switching to one of our bigger gimbals is not a solution, neither is going
to another manufacturer, the issue is the lightweight camera bodies you are
using.
Unquote

They offered options that I might want to try --
Quote
1. Get a battery grip for your camera body, or use a Pro size camera.
2. Add some more simple weight with a 1/4"-20 screw and a few washers to the
bottom of your camera. (We are actually prototyping camera weights that will
screw onto the bottom of cameras for these situations)
3. Get a rubber body protector and heavier handstrap.
4. Use a teleconverter.
5. Use a lensplate (like the SF-NX3) on the 500F4 instead of a replacement
foot. This will allow you to balance further out, but may make it difficult
to balance your setup on the Jr.3. You may need a completely different
gimbal with more swing-clearance.
Unquote
I have seen photographers with the D7000 ( no battery grip) and 500mm f/4 on a gimbal and it appeared to balance.

Someone has recommend the following from RRS:

RRS Support



So, before I spend more money that may or may not work, does anyone use this combination on a gimbal?
Does anyone have any suggestions.
I am willing to change gimbals , tripods if needed.
Side note -- I am a 5'1" female. The lightest , safest, set up would be preferred, as weight is obviously an issue for me.
Sorry for length of post .
Thanks
Birdie




May 11, 2012 at 02:12 PM
Zebrabot
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p.1 #2 · p.1 #2 · 500mm f/4, balance problems with D7000 on Gimbal


Talk to Glenn from this place:

http://www.glennview.com/35.htm (scroll down until you see the 500mm lense)

gimbals are inherently unstable and stupid, and he makes lense mounts the correct way.



May 11, 2012 at 03:17 PM
tdong
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p.1 #3 · p.1 #3 · 500mm f/4, balance problems with D7000 on Gimbal


never have this problem with my 600 and D70 (even lighter than your d7000) however I am using the long lens plate that attach to the foot instead of the replacement foot. Basical you can mount the plate to the foot at any distance you want. RRS suggest the pano plate for the 400 f2.8 you can try that it is 10 inches long

or get this 6 inches

http://acratech.net/home.php?cat=20

Gimbal is a single point pivot if you can't balance with jubo you can't balance with other gimbal. you need longer plate to adjust the centre weight



May 11, 2012 at 05:59 PM
tdong
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p.1 #4 · p.1 #4 · 500mm f/4, balance problems with D7000 on Gimbal


http://www.flickr.com/photos/grobarek/5554278179/in/photostream/

he can even balance without camera. he is using lens plate.



May 11, 2012 at 06:05 PM
tdong
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p.1 #5 · p.1 #5 · 500mm f/4, balance problems with D7000 on Gimbal


i just take a look at your jubo gimbal another solution would be to buy the longer mount to replace the one on your current gimbal.


May 11, 2012 at 06:09 PM
AMaji
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p.1 #6 · p.1 #6 · 500mm f/4, balance problems with D7000 on Gimbal


My suggestion is also to use a longer lens plate. If you upgrade your camera in the future, then you can revert back to the replacement foot.


May 11, 2012 at 06:13 PM
 

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MalbikEndar
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p.1 #7 · p.1 #7 · 500mm f/4, balance problems with D7000 on Gimbal


The screw hole on the bottom of the camera is 1/4-20 thread. I would get a short 1/4-20 screw and a chunk of metal with a 1/4" hole heavy enough to provide balance. (Washers might not be practical because you might need too many).

Cost: around a dollar and a trip to the Home Depot.

There are more expensive solutions but I'm not sure they work much better.



May 11, 2012 at 06:31 PM
John Godwin
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p.1 #8 · p.1 #8 · 500mm f/4, balance problems with D7000 on Gimbal


For a gimbal mount to work properly You need to have the pivot point at the center of gravity. That means not only along the axis of the lens but also above or below the axis. To guarantee that the mounts pivot point would be at he center of gravity it would need to be able to adjust both up and down along with forwards and back.

If your mount has only one adjustment you can have problems making the gimbal balance the load. It can be done for a level position but once you move the camera/lens above or below the horizon to take a photo the problems of not being able to adjust for that will show up.

If your mount has only one adjustment then the adding of weight can help in shifting the center of gravity up or down from the center line axis.

Both Wimberley and Jobu make mounts that have dual adjustments.






May 11, 2012 at 06:55 PM
tdong
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p.1 #9 · p.1 #9 · 500mm f/4, balance problems with D7000 on Gimbal


no that John mention it the Birdie's gimbal is very limited. It is fixed mount no up and down adjustment. better to get a different gimbal for the 500


May 11, 2012 at 07:03 PM
birdied
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p.1 #10 · p.1 #10 · 500mm f/4, balance problems with D7000 on Gimbal


Thanks everyone, your time and answers are much appreciated.
The gimbal does have a up and down adjustment which helps with the forward swing clearance , but just a little bit.
It does not help get the balance with the D7000.

I have spoken to Jobu a couple of times today and will probably go the heavier gimbal and longer plate.
Tdong, I did ask Ian at Jobu about the longer mount and he advised it still would not work.

In the meantime, will try adding some weight to the camera body and see if that will work.
By the way , I have tried adding the SB900 and it still will not balance.

Again, thank you all.

Birdie



May 11, 2012 at 10:58 PM
Scott Grant
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p.1 #11 · p.1 #11 · 500mm f/4, balance problems with D7000 on Gimbal


I just got home from a day of shooting my 500 VR and a D7000 without a grip. It balances fine on a Wimberly II. FYI i've replaced the stock foot with the 4th generation foot. It has to be moved all the way back but this does not impede any movement when on the gimbel. I am contemplating the grip regardless as the camera handles terribly in portrait orientation.


May 11, 2012 at 11:31 PM
JTMeuret
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p.1 #12 · p.1 #12 · 500mm f/4, balance problems with D7000 on Gimbal


Regarding this suggestion they gave:
3. Get a rubber body protector and heavier handstrap.

I don't know if you've ever used a rubber body protector, but they DO make the body much heavier. I have "Camera Armor" on my D80. Google it. I know that's kind of a weird solution they gave you, but it will add much more weight. Good luck. -J.T.



May 13, 2012 at 03:32 AM





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