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Message: <blockquote data-quote="Vipersan" data-source="post: 798416" data-attributes="member: 325666">Ok ..most unpleasant outside today ..Gusting winds and cold rain..Braved it just long enough to grab these pics ..I realise this isn't a foolproof accurate nor scientic test..But it does give a rough idea how well the curve is being followed...and the height discrepency between 2 adjacent wing segments .that almost 1 cm clearance under the plastic strip would make all the difference when calculating the focal length ..lifting the wing would make the dish deeper ..so 36 ..would be 37 cm ..and the focal distance when calculated would be closer to 82cm..So small errors like these ..could well account for the quirks I'm seeing.rgdsVS...Chad says..."Wotno feedback ?"... ;)</blockquote>