M13

[steviemac500 971]

This is a combination of 300s and 30s subs, combined using layer masks in PS. 300s - 72 L, 24 each in RGB, 30s - 160 L, 50 each in RGB. Processed in PI. Hope you like it, comments welcomed as always.

Steve

https://astrob.in/jq513s/E/

[x6gas 1,354]

Very nice image.  The background looks tad red to me but that may be my screen.

[steviemac500 971]

Funnily enough it does on my phone too but the laptop is fine. 

[Hallingskies 936]

Apple-type device screens are unforgiving, although your M13 looks very good indeed on my iPad right now.  What are the RGB values on the little colour sampler thingy in PS if you point it at some dark bits?  That’ll soon show if there’s any excess red.

I try and aim for 20/20/20, although it depends on how light or dark you like your backgrounds.