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Thanks everyone for this info. Much useful knowledge/experience to digest. Got a bunch of material printed out now, giving different perspectives on collimation of fast newts, which I plan to read during a long flight I'm about to take. When I get back to Oz in a week, I'll try it out.
Ray, I'm using an ICX694, so I suspect I'm not going to get a lot of vignetting. But I'll test, see, adjust, etc. I'm in this f/4 newt game for the long haul (haven't even unwrapped my 10" Quattro CF yet!), and am willing to work to get things just right - eventually.
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