Three pretty models for hand-holding: Linda, Alexa and Angénieux Optimo DP Rouge…er…Bleu. We’ve tested and confirmed that Optimo DP Rouge zooms balance well and fit on ARRI ALEXA and ALEXA Plus. The rear element of both the Optimo DP 16-42 mm T2.8 and the 30-80 mm T2.8 lightweight zooms protrude 31 mm from the PL flange. This distance is well in front of the low pass filter pack of the current ALEXAs and REDs, which do not, of course, have spinning mirror shutters.
Remember, however, that ARRI’s third intended ALEXA sibling should have a spinning mirror shutter, which will require Angénieux film-style zooms: Optimo 15-40mm T2.6 and 28-76 mm T2.6. The rear elements on those lenses do not protrude, and can even be used directly on Canon HDSLR cameras with a PL-to-Canon adapter or Angénieux neutral-to-Canon mount.
You can proclaim your camera allegiance with Angénieux Optimo DP interchangeable red, blue, or black rubber barrel rings.