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I do it with only an 80 x 400 but I train it with in the area that I intend to shoot... I use the 9 minutes to capture a nine minute shot..the buzzer is a good timer ..will be using a barlow to get higher mag some but that the way I do it so far. Capture scope is only 750mm f/l so it is forgiving but my lastest horse head at 1170 seconds was ok by me ...maybe you PE is fine mine has vary little PE and I am not complaining.. how round are your stars is all taht matters
alex
alex
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