Since, I posted the question and I had received valuable information from members of the community. I had this experience on 18th evening between 5 PM and 6 PM. I was on my apartment building rooftop. I went there to spend sometime in the open watching the evening. I also carried my camera with me. I was hoping to capture an interesting cloud, the sunset, or an odd bird that flies by.
The first thing I noticed as I got my camera ready was a pigeon flying around. I reacted by clicking a shot – only one shot (pigeons fly quite fast averaging 50+ mph).
This picture shows some motion blur. I believe the blur is not due to focus (the focus points cover part of the bird). I don’t know if there was a camera shake.
Aperture: f/5.6, Shutter Speed: 1/1000s (Auto), Exposure Mode: Aperture Priority, Metering: Matrix, ISO Sensitivity: ISO 400
After a few minutes of flying the bird landed on the side of the building I was on. I had a chance to take one shot.
The picture shows the blur induced by depth of field (the foreground and background of the target has the blur). I needed an aperture where I could not miss the bird.
Aperture: f/4, Shutter Speed: 1/2500s (Auto), Exposure Mode: Aperture Priority, Metering: Matrix, ISO Sensitivity: ISO 400
This shot is with motion blur.
Aperture: f/4, Shutter Speed: 1/4000s (Auto), Exposure Mode: Aperture Priority, Metering: Matrix, ISO Sensitivity: ISO 640
This one with no motion blur.
Aperture: f/5, Shutter Speed: 1/2000s (Auto), Exposure Mode: Shutter Priority, Metering: Matrix, ISO Sensitivity: ISO 640
An unexpected visitor.
Aperture: f/5, Shutter Speed: 1/2000s (Auto), Exposure Mode: Shutter Priority, Metering: Matrix, ISO Sensitivity: ISO 800
Cannot miss this one.
Aperture: f/4.5, Shutter Speed: 1/2000s (Auto), Exposure Mode: Shutter Priority, Metering: Matrix, ISO Sensitivity: ISO 800
Finally, here is a blur induced by surprise. I was focused on something for a few minutes. As I turned my head I saw these two about 10 feet from me. I could just point and shoot with whatever setting urgently. They left immediately.
Aperture: f/2, Shutter Speed: 1/2000s (Auto), Exposure Mode: Shutter Priority, Metering: Matrix, ISO Sensitivity: ISO 800