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If you get you PA right Ernie you will find you can go that long. Tom from SB said this is what you should do to get PE sorted. I use Precision PEC and CCDsoft for that job. I want to do another run soon, when I have time. Will need to do it for the 12" refinement. Only done PEC for the TSA so far. The parameters are a lot wider given the focal length.
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