Re: GTO vs AE/AEL data #Absolute_Encoders

Cheng-Yang Tan

Hi Christopher,
    I have a very similar setup as yours after you get the AP1100AE:

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I have the AP1100AE. I was imaging on Friday night which started out pretty calm but near midnight the winds picked up and it had wind gusts around 8 mph.

Here's my guide graphs before the winds picked up with guide error of 0.22 arcsec.

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Here's the guide graphs after the winds picked up. Guide error is now 0.45 arcs.

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The guiding definitely does get worse with wind as expected but it's still below 0.5 arcsec. And for the pixel scale that I am using, it's not a problem.

Perhaps there are better settings in PHD2 to be more aggressive in the corrections:

X guide algorithm = Hysteresis, Hysteresis = 0.100, Aggression = 0.700, Minimum move = 0.210
Y guide algorithm = Lowpass2, Aggressiveness = 80.000, Minimum move = 0.210

and the exposure time is 3s. (For whatever reasonm PHDLOG2 thinks that it is 1s, I actually have a screen capture to prove that it is 3 s).


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