All the macro work is stunning, but other than that, Feb and Oct are my faves.

All good - but another vote for No 2! Superb shot...

K3ii body. I'm assuming it is lenses I already have. So 16-85, DA300 and ...there will be dark skies, so Sigma 15mm f2.8. Does mean I need a tripod...

Thanks for the reminder, just downloading it now. As I have my Pentaxes set to produce DNG raw files, even if I buy a new body, I will not be looking to move from v6.14 anytime soon. No immediate prospect of buying a new body, I'm very happy with my K3ii.

Cheers

Paul

Get your k3ii to output Raw files as DNG not PEF. Problem solved!

Also this may give you some pointers - https://www.dpreview.com/forums/thread/3969445

Very impressive set! Interesting technique in merging an astrotracer shot of the sky with a "conventional" shot of the ground. Normally when merging panos I just let Lightroom sort the merge point out, but for this, do you need to do it manually?

Cheers

Paul

Super images!

Ok first things first, your photographs need to be correctly exposed. If they are too dark or too light colours never look correct. You can fix this to a degree in post processing, particularly if shooting RAW.
You need an understanding of colour gamut and colour spaces - try this -
https://www.color-management-guide.com/choosing-between-srgb-adobe-rgb-and-proph...
Once the photos are correctly exposed, then you need to be shooting and post processing in RAW. If you have shot in jpeg then you will probably be in sRGB (the most limited of the 3 normal colour space options) and some of the colours you want to capture may be "out of gamut" and hence lost for good. You also only have 8 bits of colour info per channel in jpeg, RAW gives you 12 (I think..) for the K20.
Also for colour-critical work (which it sounds like you are doing) you need a fully colour managed workflow, using custom profiles for your camera, monitor and any printers. Obviously the light you shoot the paintings in also needs to be controlled, using daylight bulbs or flash.
Finally if your photos are correctly exposed and you are shooting and post processing in RAW, and you still don't have the colours you want, then it is likely that the camera is capturing the colours that you need - it may be that your monitor is not able to display them. Most cheaper monitors can only display the narrower sRGB colour gamut. If the "colours that are not displayed correctly" are outside your monitor's colour gamut, then you will never see them on that monitor.
However looking on the bright side, if you send the digital file to a wide gamut printer, all may be well!
Hope this helps, let me know if you need more.

Paul

Another vote for the 16-85. Meets 95% of my needs, and worked well in narrow streets of old italian villages.