These would work great too. The bigger the ball the better, anything over 35mm seems to be good enough.That’s a big tripod - if weight isn’t a prime concern, a used Arca-Swiss Monoball head is big (55mm ball) and stout. It’s an old design and these were the original professional quality ball head and the company originally came up with Arca rail. Used, a good deal is $100, but $150 is more common. Our family must have six of these on big tripods we don’t carry around for glassing and I’ve started using one shooting with a plate.
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If you are putting it on a rrs ascend, I would keep it a nice setup and go anvil 30. that way it is more functional if you decide not to use it just a bag and plate. Speaking of which, my son sells bag and plate combos but currently out of stock on the bags if interested.Looking for a tripod head recommendation. I will only be using the head for a plate with a shooting bag on top of it. Not interested in cheap chinese crap etc. Going on a RRS ascend. Would like the BH30 but it is overkill for what it will be used for.