If I may suggest a test to someone who has an i1Pro 3... BabelColor CT&A can be installed in demo mode (WARNING!, this is software I sell). In the instrument menu there are the following choices: i1Pro / i1Pro 2 (non-XRGA) and i1Pro / i1Pro 2 (XRGA) each corresponding to a different driver. The non-XRGA driver is an old i1Pro only 32 bit driver and will thus not appear in the macOS 64 bit version of CT&A. When connecting an i1Pro 2 using the non-XRGA driver, the instrument is recognized and behaves as an i1Pro. This is what Graeme refers to as backward compatible. The test would be to (try to) connect an i1Pro 3 to each driver and see if it is recognized as an i1Pro in the non-XRGA driver and as an i1Pro 2 in the XRGA driver. Danny Pascale dpascale@babelcolor.com www.babelcolor.com On Mon, 14 Oct 2019 16:00:52 +1100, Graeme Gill via colorsync-users <colorsync-users@lists.apple.com> wrote: Scott Martin wrote: > Hey Graeme! While the large aperture has advantages, it does mean that it can’t read > smaller patches intended for a small aperture device like the i1Pro2. So, there's no > compatibility mode. Hi, sorry, I don't understand what the aperture has to do with it. As you know, the i1pro2 has an i1pro1 fallback compatibility mode, so it would seem a reasonable possibility that the i1pro3+ has an i1pro2 fallback mode. The change in aperture would only seem to be relevant in printing test charts. Cheers, Graeme Gill. _______________________________________________