[no_identd]

Sorry for the late reply. Chromatic aberrations primarily originate from glasses with a low Abbe number, which ROUGHLY (_but not strictly!_ RARE [and expensive] exceptions exist!) correlates with glasses with a high refractive index. Get glasses with a high Abbe number (which you'll likely find in glasses with a low refractive index) and the chromatic ab(b)errations will disappear. The price you have to pay: They'll end up heavier. But only slightly, thanks to modern organic glass polymers whose surface we, via surface treatment, can make harder than mineralic glass nowadays. A capability that has only appeared in the last few years.

As for the rest, the advice given in the other reply to your comment seems sound.