Larry 1969 wrote: ↑Tue Jul 13, 2021 10:28 pm
Ok... I'm looking at my APP settings right now and have this:
Algorithm - Adaptive Airy Disc
Calibrate - save 32 bit masters - NO DARK SCALING (BUT I deselected "Adaptive pedestal / Reduce Amp Glow") because that was recommended for use with StarTools...
And finally, I had No LNC selected... Everything else was default... I wonder what could have went wrong???
I also did notice your dithering in the stacked image. It's MUCH smaller than mine. I use APT to manage my sessions and I have it set to dither 1 pixel but my guide cam has huge pixels (7.4 um) so it moves quite a bit...
I too keep adaptive pedestal checked and I dont think that that LNC could cause this issue - I really thinks its happening at calibration.
Honestly I'm starting to get beyond my abilities or knowledge on this but heres what I'm thinking. Your screenshot without bias does not look like the flats have not been applied but rather that they have been OVER-applied - i.e. overcompensated. Those areas which needed to be lightened a bit to flatten the field have been lightened way to much so they are now showing the negative
of how they started. The one with the bias looks like what I'd expect if no flats were applied.
Have you looked at individual images pre and post calibration (by changing the drop down window at top) This may give you some clues.This is what mines look like - this is a heavy stretch to see whats going on.
If the individuals look corrected then you know its an integration problem but I dont see how that could be. You can further step through registration and normalization in that dropdown but again I dont think this will be happening at either of those.
Take a look at you masters (particularly the MF) compared to the ones I put in the folder yesterday - that may tell you something.
Do you have the calibration warnings box checked, that will tell you real time if somethings going wrong.
Double check that you have added the darks, flats and dark flats in the right place - I've mixed up calibration types at loading before!
For long enough with my DSLR
's I would add darks, flat darks, flats and bias so I dont think the bias is an issue here. But no harm in leaving it out anyway when you have darks and dark-flats.
So, I really cant explain whats happened there. The run I did yesterday was with the files from the shared drive so its not that I've put in the wrong darks or something (which was my immediate concern!)
Id suggest you start from scratch, reload all lights and calibration frames, check all settings (make sure that integration of each calibration type is set to automatic in the calibration tab) and give it another go.
Scope: Skywatcher Evostar 80ED (SW 0.85 FR/FF) on a SW NEQ6Pro
Guiding; SW Evoguide 50ED, ASI 120mm mini
Meade 8" LX200 GPS on wedge (Guided with a cheapo 50mm guidescope and a ZWO ASI 120mm mini)
Sharpstar 61EDPH II (with dedicated 0.8 reducer) with wiliam Optics 32mm uniguide
Camera: ASI2600MC pro. QHY 163M with ZWO 7nm NB filters, Canon EOS700D astro mod
Secondary mount: Skywatcher StarAdventurer
My Astrobin https://www.astrobin.com/users/mackiedlm/