[doppler (Rick)]

You can use a yellow filter or a light pollution filter which will reduce the effects a bit, but CA is worst on short focal length achromatic scopes, Baader also make some specialty filters for this purpose.

The CA is not to bad if you have no bright stars in the field of view though, M31 no filter 120mm f5 achro, and sometimes it works really well, January's lunar eclipse.

Here's an example of the Orion nebula with a light pollution filter, 120mm f5 achro refractor.