Re: Mach2 and APCC last night
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FYI, although I don't have a Mach2, I have an AP1100 with absolute encoders. For me, the PHD2 rms guide errors are *strongly* dependent on seeing conditions. Last week on 06 March, when the seeing was terrible around here, even with encoders, the guiding was ~0.9 arcsec rms! But on Sunday night, 15 Mar, guiding was very good ~0.3 arc sec rms because the seeing was good. So although encoders help with getting rid of PE, don't expect miracles if seeing is bad.
On Tuesday, March 17, 2020, 08:05:34 AM CDT, Terri Zittritsch <theresamarie11@...> wrote:
On Mon, Mar 16, 2020 at 10:22 PM, Allen Ruckle wrote:
Terry,Allen, The atmosphere creates significant star movement in my less exotic locale (at 155M in Vermont under the jet stream). And what I'm reporting is guiding (i'm actively guiding), not tracking. So your .21 and .27 results in around .34 arc seconds total (root of sum of squares). What I report you should compare to the .34. I think almost all of what i see is the atmosphere and some due to my lack of precision in setting the right guiding parameters and some over-correction, that which then needs to be corrected. Plus, I am a portable mount, and about the best polar alignment I get is around an arc minute, maybe a bit less, but this will result in some drift that needs correction.
Since I've never owned another A-P mount, it's hard for me to compare. Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.