Quote:
Originally Posted by Peter Ward
Just some history to PME/PMX etc.
The original PME's had 2.5 arc sec of PE. Problem was it took a day or two *just to set-up the worm* and measure the bearing run-out, to make that lofty spec happen.
So the next batch was 7 arc sec.
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Are you totally sure about that? If so then I guess I got lucky here. (And alas I'm never lucky at anything.) My PME which I purchased new directly from SB in August 2010 has 3 arc seconds peak to peak raw PE. It's sub arc second after programming PEC.
I had a GT-1100S before that which I purchased new directly from SB in 2000 and sold in 2010. It had a raw PE of 5 arc seconds peak to peak. In all the time I had it I never programmed the PEC and never really noticed the PE. All I ever did with that mount was planetary imaging at high focal lengths and C-14 Fastar imaging at low focal lengths. The only reason why I even knew it was 5 was because one of the potential purchasers asked me to measure it a few weeks before it finally sold.