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I had a play last night the WO page says the recommended distance is 71.5mm for my scope with no other explanation other than a technical looking diagram that only someone who already understood the issue completely would be able to make sense of.
I set the flattener to an estimate of 71.5mm (there is no gradation on the scale, just min of 66 middle of 76 and max of 86) took a shot and it looked pretty good. I tried some other settings but gravitated back to around 71mm so tightened it down there. I noticed the effect is not even across the entire frame, some corners had more rounded stars than others depending on small adjustments to the settings so I just went for what looked best overall. I guess that is all there is to it.
Last edited by Spookyer; 22-09-2013 at 08:15 AM.
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