Ion cannon is seen in TESB, where it disabled Imperial Star Destroyer with two shots, seemingly bypassing its shields. It might be only type of common SW weapons able to seriously threaten Star Trek capital ships, however, so far, we have no evidence of Star Wars ships mounting them.
Here we have ISD moments before it is disabled by Rebel Ion Cannon. Half of planet's diameter is 72 mm, so full diameter is 144 mm. Height of picture is 74 mm. So we have:
OD / 12000km = 35mm / 68mm
OD = (35 mm / 68 mm) x 12 000 km
OD = 6 176 km.
for effective range of 6 000 km against almost stationary ISD (in fact, from perspective ot platform, it is completely stationary, since it was moving forward at speed of at most few dozen meters per second).
No other active PD systems were seen in canon.
Capable of disabling Imperial Star Destroyer in two shots; otherwise unquantifiable. Bolts produced no apparent physical damage to hull but disabled electronics and engines.
