Image Stacking after a meridian flip

[alanrock]

Is there anything special that needs to be done if I'm stacking images created on either side of the meridian? Does PI just "know" what to do? Obviously the orientation of the image is different, so I'm just wondering if I need to do anything special in BPP, for example, or if I need to do something to the images beforehand. Thanks!

[aworonow]

If you have a field rotator, your flats need to be done in E and W orientations and applied separately. Otherwise, no problem. PI's star alignment will automatically rotate the images to the orientation of the reference image prior to stacking.

[alanrock]

Thanks! (how cool is that?)

[monkeybird747]

I use auto meridian flips and never move/rotate the camera after a flip. I take flats after the imaging session is complete and feed it all in to PI without even thinking about it. Works great! But yeah, if you rotated your camera independently of the OTA after the flip you'd have to do as above with your flats. I think the computing time of star alignment takes a little longer with images that are 180 out from each other, but PI powers through with no problem. (And yeah, it's wicked cool!)