The fault in my stars

[JohnH]

John

That is much better!  Your image still shows tilt which I am sure can be corrected.  If you are user of NINA, there's a new plugin that helps assess tilt and backfocus errors for imagers.  It is called Hocus Focus.  I very much recommend testing it out.  ASTAP also has a tilt analysis routine.   There's a (very long) thread on CloudyNights about both:  https://www.cloudynights.com/topic/809050-tilt-discussion-astap/page-19#entry11789196

Roberto

Thanks Roberto,

That is a loooooonnnnngggg thread!! I have used ASTAP and it suggests that my tilt is now 8%. Perfection is to be desired but I do not know if I will really be able to improve.

I do not use (or know anything about) NINA or Hocus Focus but I will look them up.

I have been trying to fix backfocus, it seems a dark art.

I hope to get some RGB data for Cederblad 214 tonight with the same telescope collimation. I will then have another tinker and see if I can improve anything.

Regards,

John

[The Thing]

Hi John,

Good  luck. I'm also embarking on the NINA/Hocus Focus (plug-in) trek as I have similar problems with one corner being shown to be way out by ASTAP. I use NINA all the time but not this plug-in, the latest version of which looks very comprehensive for image train problem analysis.

Duncan

[JohnH]

Hi John,

Good  luck. I'm also embarking on the NINA/Hocus Focus (plug-in) trek as I have similar problems with one corner being shown to be way out by ASTAP. I use NINA all the time but not this plug-in, the latest version of which looks very comprehensive for image train problem analysis.

Duncan

Hi Duncan,

From what I see this is not for me as it seems to be ASCOM based. I am Mac which does not run ASCOM, the equivalent is INDIGO which does not offer these functions.

I wasted Tuesday's imaging (not sure what I did but my Flats all have a mysterious ring which is not visible on the raw lights.

I might be able to have another go tonight and see what results.

Regards,

John

[The Thing]

If its a ring like a doughnut over the whole image thats another problem I'm trying to get a handle on. Apparently it may be caused by the flats light source colour being different to the subs causing a different Newtons ring pattern on each so the flat doesn't correct it out. Apparently.

[Mac]

I am Mac

Thats normally my line.

Can you not run a virtual PC with USB Access?
You might need usb to serial cables

The cpu usage when running the ascomm software on a true PC is negligible, a virtual PC on a mac would run any ascomm software with out any speed issues.

Worth a try.

The real Mac. 

[JohnH]

I am Mac

Thats normally my line.

Can you not run a virtual PC with USB Access?
You might need usb to serial cables

The cpu usage when running the ascomm software on a true PC is negligible, a virtual PC on a mac would run any ascomm software with out any speed issues.

Worth a try.

The real Mac. 

I can try (I do have emulator software), but Windows and Ascom are an undiscovered continent for me.

Regards,

John

[The Thing]

FYI YouTube video taking you through Hocus Focus in NINA.

Hi John,

Good  luck. I'm also embarking on the NINA/Hocus Focus (plug-in) trek as I have similar problems with one corner being shown to be way out by ASTAP. I use NINA all the time but not this plug-in, the latest version of which looks very comprehensive for image train problem analysis.

Duncan