Hi Izzie, Thanks for looking and commenting. Sorry to hear that your shutter is not behaving properly.
I didn't have to keep my eye on the bird for very long at all. I regularly visit an area not far from where I live, where I know that there is a good chance of getting a shot of a bird or two. Along one side of an open area that has a few trees in it, there is a line of low bushes that extends about 500 meters.
I usually walk along the length of the row of bushes with my camera switched ON, and with the shutter speed and aperture pre-set, ready to go. These days, I nearly always have the ISO set to 'Auto' - it saves a lot of time. A 400mm lens allows me to walk far enough away from the bushes so as not to startle any of the small birds (most of the time). When I see a bird like this little wren, I immediately stop walking and focus my attention completely on it.
Many times, by the time I have raised my camera, the bird has taken flight or, moved to a different branch in the same bush. If it has taken flight, it is usually just to the next bush along the line. So I carefully walk towards it, sometimes keeping the bird in sight through the viewfinder as I walk.
Once I have a clear line, it's just a matter of focussing and pressing the shutter release. No wasted time changing the settings.
My lens/camera combination focusses very quickly, I'm sure that's a big factor.
The background colours are the colours that were in the shot. Cloning out the unwanted branches and other distractions is simply a matter of choosing some of the 'good' BG and cloning over the unwanted branches. When all of the distractions are gone the BG can look a bit patchy, though at least it has the colours that were originally in the frame.
To fix the patchiness, I continue to clone with a large, soft, brush. The opacity is very low (10 to 20%), gradually blending colour from one area to another.
Thanks again, Izzie.