Well, it's finally there, testing is appreciate! For more details, check out:

knro.blogspot.com/2015/02/3d-cube-fits-d...pport-in-kstars.html

great work testing today

Ok I have to admit I have no clue what's that 3D cube thing and a "debayer" is. Seems to be something spectrographic thing isnt it?.
All I noticed is that the fits in the viewer I took from from my Canon (RAW mode in ekos) are not anymore grey but green or is this just because the color distribution is different in a fits?
Is there any advantage for the ordinary canon user over using the "NATIVE" option and use the original canon CR2's with the size of about 25MB/picture instead of taking a "RAW" 3D cube thing FITS with ~100MB/picture?

3D cube FITS is fancy name for "Color FITS". For GPhoto, if you capture in JPEG, the image is stored as Color FITS and gets sent to Ekos. If you take a raw image, it is NOT sent as a color FITS, but rather as RAW FITS with bayer information embedded in the FITS header. It get debayered automatically by the FITSVIewer tool but you can adjust the debayering parameters. The RAW image is showed as is without any stretch/adjustments and this is why it looks funny.

At any rate, as I said in my blog, this is useful for inspection purposes. When you capture images of your astro targets, use "Native" method (not FITS) and select "RAW" as the file type.