Tracking Errors web-component scale

[Jeff Herman]

I swapped in a different guide-camera and using a different binning. The result is my guider's image-scale is quite different than my previous setup. All is well except the tracking-errors web-component seems like it might be displaying in the wrong scale. It doesn't seem to match the guide-errors x/y web-component values. Is there possibly a config setting I've missed or maybe a way to reset it for my new setup?

[Bob Denny]

The web guide error display is in pixels, and comes right from MaxIm's X and Y (pixel) errors. While guiding, look at MaxIm's guide tab and see if the errors there match the errors in the graph. Hovering over the graph will show the error at each point. If they don't match then something weird is going on inside Maxim.

Pending a "discovery" I'm moving this to the "Other software" section because I don't know how ACP can alter the XY values coming from MaxIm.

[Jeff Herman]

I confirmed that when hovering over the graph I get the same values MaxIm is reporting. I think the issue is the new guider setup is at .65 arcseconds/pixel where as my old one was at 2 arcseconds/pixel (after binning). I'm just used to seeing the old scale so when I see this new scale it makes my guiding look awful when it actually isn't. I'll probably bin my new setup to get 1.3 arcseconds/pixel since I don't need .65 anyway (kind of overkill). But... it would be great to have an option on the web-component to see it in arcseconds instead of pixels since arcseconds normalizes things and is arguably more meaningful anyway. MaxIm's graph has this option which I usually use.

[Bob Denny]

Actually guiding with less than 1 arcsec/pixel is not only "overkill" but it can actually make things worse. 0.65 x 2 = 1.3 arcsec/pixel is a good number. I learned this from Mike Rice (rest his soul) years ago.

[Jeff Herman]

Quick reality-check on the guide-sensor-scale used for dithering (setting in the imaging tab): Should that be the binned scale of the guider (e.g. 1.3 in my case) or should it be the un-binned value (0.65) even though I am binning the guider in MaxIm?

[Bob Denny]

Use the binned/actual plate scale. ACP does not look at guider binning, it just uses the value you provide as the conversion between main imager and guider dither.