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Peter,
Alex beat me to the reply. He's spot on.
I also have the "advanced" focuser. I think all they mean by that is that it can carry a larger load and is rotating. That's about it, I think. I'm saving my pennies for a 2.5" Moonlite. I'm not too fussed if that won't illuminate the entire field on a 35mm frame, as, I have plans to jump into the CCD world. So, with an APS-C size chip of the 8300, which is very similar to a standard 1.6x crop Canon, you don't have to worry about vignetting. Feel free to refer to the images I've posted lately taken with the ED127 and 40D. No vignetting.
H
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