Hi Linda,
You're right about the canvas holders, they adjust to any height without regard to the paint tray by sliding up and down the main mast. Once the canvas or panel has been clamped at the desired location, all three pieces move up and down together as a unit. That feature is what makes it so desirable; I can start out standing, but switch to sitting if/when I get tired and just use a finger to pull the canvas back to eye level.
When I was building prototypes of the easel, I thought about adding a side to side ability, but it would have added a fair number of additional pieces and cost, as well as an opportunity for some shimmy to creep in.
For me personally, when I sit, it's on a drafting stool with wheels, and figured when I stand it's not too tough to take a step or two to one side, though I admit that on really big horizontal formats it's easier when I'm using my wooden palette in hand than the glass palette on the rolling taboret.
For anyone looking for the sideways motion as well, Hughes makes a very nice easel that has this feature. My quibble about buying one was the expense (though ultimately I probably ended up spending much more in developing mine) and the lack of a paint tray which I just find too useful to give up.
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