tradesmith45
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I have one but its heavy for backpacking - 1.5x the weight of my ball head. I've recommend to members of my photo club using one of these instead of a ball head UNDER a Vixen. Makes alignment easier. But in either case, it means all leveling has to be done with the tripod legs.I’ve considered replacing the ball head I use on my Vixen Polarie with one of these:A local machine shop can make something like this for you for maybe $100.Thanks Terry. Love the design of the wedge. I've been trying to solve the problem that this fixes. Wish it was available commercially.This is a DIY 45º wedge made from a sawed off piece of 2" Al bar stock. I ventilated it to cut the weight in half. I backpack so weight matters.
Its purpose is placing the ball head in a position so ball remains in the region with max movement rather than in the notch. This makes it easier to shot panos from atop a tracker. W/ the ball in the notch, its common to have to adjust both the base & ball while making a pano.
I'm considering switching to an Acratech Ultimate head.
But the other thing this wedge does is make the use of a simple nodal rail possible for pano. W/ a rail only, you must use the ball head panning base for rotations when the camera is tilted up/down in order to rotate around the lens nodal point. The camera has to be slid back/forth when tilted to place the nodal point over the axis of the head. This is complicated to write but easy to see if you try it.
Joe
One problem w/ my DIY design is that to reposition the wedge, you have to run the tracker awhile if yours doesn't have a clutch system. An open design that Roger uses would allow use of a nut to attach the wedge an any desire position. Problem there is many trackers have very short tripod studs so the plate has to be thin & probably flexible.
You could also try Z plates from eBay or Amazon. Don't know how sturdy these are.
https://www.bhphotovideo.com/c/product/1182201-REG/sirui_bsrl20s_l_20s_2_way_pan_tilt_head.html
