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My DIY scope using an ISTAR ''PERSEUS'' 127MM F8 lens is an excellent performer,purchased the lens here on IIS. Absolutely minimal ca,even on the moon and planets,shows pinpoint stars and performs brilliantly on dso's.
This is an older lens and its said that the current offering are something of an improvement. I'm very happy with what i have and don't feel the need to upgrade even at ISTAR'S very reasonable prices. My TSA 102 gets used a lot less now as the ISTAR is just more versatile and very enjoyable to use.
Frank.
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