My favorite type of shot and caught 3 photographs of the flight.
We can normally get a multi image flight series but this was different. Poor light… and a suspect lens.
We have an older Canon 100-400 that has gone out of daily use. These were captured using the old lens.
The Canon L series, this is one of that group, is known to be some of the best glass made. We replaced this lens in question with a newer version 100-400.
For most of the day this old lens kept up just fine. However, end of day the focus motor started to grind and at one point quit for a while. We use our gear a lot and even the best can wear out.
Because the early work came out good I will keep it for a mid range back up in case of an emergency.