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A wonderfully clear week here. Dedicated last night to the iStar 127mm f12 (1524mm fl) on the three big planets currently overhead. Jupiter and Saturn were wonderfully sharp and stable until I added my 2x Televue Barlow - when things got fuzzy. I had tried the Edge Hd8 the night before ( at 2032mm fl) and had the same result. The iStar certainly gave a better view than the Edge HD8 at native focal length. Mars was the most disappointing of the three but I suspect it had to do with altitude, with Mars being only 40 degrees high compared to observing Jupiter and Saturn above 60 degrees. Think I need to get an Orange filter too.
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