S50 EQ mode Weird Color Aberration

JET

Since transitioning to EQ mode i have run across weird looking color gradients. I never had this issue targeting nebula, galaxies or star clusters before. Even imaging during a full moon never had this happen. This only started happening when switched to EQ.

The M101 was 9 hours on target with 7.5 hours of data at end of imaging facing north with only about 38% moon in the last couple hours of imaging..
The M13 was 3 hours facing south with about 40% moon in the last hours of the imaging.

As stated before, i have imaged with a full moon in Alt-Az and never has this before.

Some have suggested it due to no dithering in EQ mode?
Any suggestions on how to eliminate this?

If i continue to use EQ, should i use Alt_alp? Doe it allow for dithering ot be added?

Help please

See attached photos

Brille

The visible banding and color shifts in EQ-Mode have already been criticized by some people here, including me. The current information from ZWO is that these are peculiarities of the sensor that become particularly clear when stacking in EQ mode. In AltAz mode, the image field rotates so that the sensor also rotates, thus reducing the errors in the sum image.
These problems can normally be corrected with flat images. In future, the app will be expanded to include the option of taking flats in addition to the darks before the actual imaging starts.

JWRI97

Brille

This is good to know about the possibility of introducing flats. I have been wrestling to remove the banding in Pixinsight and whilst I can get it under control its a pain to deal with and even after careful processing its still there upon closer inspection.

Tim1343

This is very helpful to know, I thought I was doing something wrong with my EQ images as they have become very mottled in appearance.

JET

JWRI97
I have not been able to figure out how to make my galaxy look good trying to fix this issue. I was hope more data over differnt night would help ,but it did not. Maybe someone who is really good in PI could fix it but i don't have the skill or knowledge myself

wvreeven

Flats alone may not be sufficient. The usual way to avoid this kind of background issues is to apply dithering while imaging.

JET

wvreeven yeah dithering in EQ mode would help alot i think

ShaneRay

I have been having the exact same problem with my S30