Cloudy day exercise

What to do during cloudy day? Here're two shots of the cloud, one in IR and one in white light (including IR signal), narrower bandwidth is always sharper, I guess it's due to the fact that it's less demanding on the optics, and it's also less affected by seeing:-

1654 (GMT+8), IR:-


1655 (GMT+8), white light:-


A bird taken with a Cosmicar 150mm f/3.2:-