I didn't see any colour fringes when testing the Harpia on Islay and there were plenty of opportunities with white gulls against dark seas and skies as well as black Jackdaws and Red-billed Choughs against white clouds.
When viewing photos with chromatic aberration how can you be sure the camera/lens was not the source of the fringes?
I always ask myself such questions before considering a new instrument for purchase, especially as this is the most expensive scope on the market and as such difficult to test at least here in Germany. There are only two knowledgeable and reputable dealers that carry the HARPIA 95 and they are several hundreds of kilometers away from where I live. Although I am a very happy user of a KOWA 883 PROMINAR, the large imaged object field kept over the focus range and the objective diameter of 95 mm is quite impressive.
The more answers we get here the better. Usually the chromatic aberration of the magnification (Farbquerfehler, Farbvergrößerungsfehler, German) -and this was displayed within the quoted picture- is caused by wrong combinations of optical components (e.g. distance between instrument and camera adapter optics, wrong dispersion of camera adapter lens groups), but also can come from misaligned instruments themselves (e.g. wrong distance of lens groups and also missing stops within a beam path etc.).
BTW: Are there any elaborate camera adapters from ZEISS for the HARPIA specifically designed for MFT cameras available yet?