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Frank, I have to disagree with you re. the Panatar. I own one (also from eBay) and at small throw ratios, even set as low as 1.33x, there is considerable pincushion distortion.
My throw ratio is 2.1:1, fairly normal, and the pincushion distortion is about 2.3% (drop from top corner to middle of screen, bottom and top edges combined = 2.3% of screen height), or about 6/10ths [twice] of an inch on a 120 inch wide screen.
And they're heavy! Mine weighs in at about 13 pounds and is nearly a foot long. Also, with my particular set-up (this wouldn't apply to everyone's setup), which is angled to the right and down to the center of the screen (the shape of the room determines this for me), I get ghost reflections if I'm not careful (I emphasise this is just in my peculiar setup. A straight-on projection angle would be OK).
Cinemas typically run out to throw ratios of 3.5:1 to 4:1. A couple of Coke bottles end on end in a toilet paper tube would give pretty good results, even at a 2x expansion.
Must say, though, that the Panatars are pretty sharp. About as sharp as you can get, if you don't mind the weight.
By the way, removing the prism assembly from the metal casing reduces the weight from 13 pounds to 11.5 pounds. Most of the weight is in the glass, not the casing. That lens is a real door stopper!
Still, they're a real bit of history to own. The pioneer of Cinemascope projection, back from the early 1950s.
Mine is now in honorable retirement (as a door-stopper!)