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Re: Autoguider correction frequency
I have a few questions if you don't mind.
Maybe I am having a senior moment, but what is PHD?
Antoher question or confirmation is "Is aggressiveness set to 60 "
equivalent to 60% correction or what would be "6" in CCDSoft or
Finally a comment or my misunderstanding. I would think that for a
guider (with the setttings as described) not to make any corrections
for 5 minutes implies two things; first that the worm drive has
virtually no periodic error (meaning less then 0.05 arc sec), and
second, that the sky has virtually no turbulance.
If my guider did not make any corrections for 5 minutes, I would
expect that something was wrong.
Here are some of my settings with an AP155 on a AP1200 mount, guided
with a Tak FS60C and ST :
Periodic error = less than 0.8 arc secs PtP
Guider settings: Min error=0.04 pixels Max error=0.10 pixels, rate =
1x, aggressiveness 5 (=50%), exposure 2 secs
With these settings I am getting RMS guider errors of approximately
0.08 pixels and instantaneous errors not usually exceeding 0.2 pixels
This is on average seeing evenings. Even with these readings, I am
getting real corrections on mnay of the cycles.
Maybe this information is of some use to you and others.
--- In ap-gto@..., "hewholooks" <hewholooks@...> wrote:
set to 0.5 and PHD RA agress set to 60. I have never seenanything
like this. PHD is on vacation - maybe, MAYBE one correction every5
or 10 minutes and that's only 0.3 pixels (1.3 arcsec).like a
DSIchange,loadedor independant webcam to guide with.
thethat's apoor assumption on my part, I should have looked.
ASCOMitpanel - NOT the PHD settings) when you used PHD - I believe
hasuse1x, 0.5x, and 0.25x as choices. I was wondering which to
aggressivenesswhen Igive it a try. Also, while I'm asking, what RA
Lastmeroughweek Itried the guider for the first time and found that for mypolaralignment and available stars, 2 second exposures provided
thehavewithperfectround stars for my 15 minute test frame. I'm sure I couldgone longerbetween exposures but since it worked I didn't mess with
from (Isettings afterthat. One note, I did have to reduce the ms step size
starthink thedefault was 1000ms) to like 100ms. By default, the cal
100ms,wouldquicklyleave the cal box if left alone. Once I changed it to
andthisreducedhow far the mount would move and I had solid guiding.
mount.havegotsome very sharp images with a TAK scope on an AP900
seemssettingParamount MEdo they have for the corrections. I have a friend with awho says his guider corrects 10 times a second; this
Linksguiderratherhighto me. Does anyone have strong views as to how often thelistshouldcorrect a reasonable AP900 ?
see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links