Here are my own rules for scanning for birds with binoculars. I hope that this will inspire others to add suggestions that will be useful to me, and to others. It's based on my local patch, which is mostly paths and lanes through farmland.
1) I can identify birds through binoculars that I haven't even noticed without them, so scanning does make sense even when there aren't any birds to be seen.
2) Looking directly at vegetation so thick that you can't see light through it is usually a waste of time, even when you can hear a bird singing there. If I hear something singing from a hedge that isn't too dense, I shift from side to side while looking with the naked eye in what I hope is the right direction, in case there is vegetation directly between the bird and me. I should also remember that I don't get a good idea of position from birdsong, because very often the singing stops just as a bird flushes nowhere near where I was looking.
3) Looking too far away can be very frustrating, because you'll pick up a lot of stuff you can't identify, but it can pay off, with buzzards, swifts, and other distinctive and interesting birds.
4) Scanning along the tops of trees and hedges will pick up quite a few birds, especially birds that have chosen an exposed perch to sing from. It also seems to pick up more distant birds in flight surprisingly often.
5) When you are about to walk round a corner, get ready to spot the birds that will take flight as soon as they see you.
6) To pick up birds in flight, keep looking at the bird as you raise the binoculars to your eyes, then look slightly ahead of the bird, wait a moment, and hope for the best. Or you could just follow it with the naked eye and hope it lands somewhere not too far away, because identifying small birds in flight is not that easy.
7) When you've finished tracking the bird you flushed, take a good look at where it came from; there might be more there.
1) I can identify birds through binoculars that I haven't even noticed without them, so scanning does make sense even when there aren't any birds to be seen.
2) Looking directly at vegetation so thick that you can't see light through it is usually a waste of time, even when you can hear a bird singing there. If I hear something singing from a hedge that isn't too dense, I shift from side to side while looking with the naked eye in what I hope is the right direction, in case there is vegetation directly between the bird and me. I should also remember that I don't get a good idea of position from birdsong, because very often the singing stops just as a bird flushes nowhere near where I was looking.
3) Looking too far away can be very frustrating, because you'll pick up a lot of stuff you can't identify, but it can pay off, with buzzards, swifts, and other distinctive and interesting birds.
4) Scanning along the tops of trees and hedges will pick up quite a few birds, especially birds that have chosen an exposed perch to sing from. It also seems to pick up more distant birds in flight surprisingly often.
5) When you are about to walk round a corner, get ready to spot the birds that will take flight as soon as they see you.
6) To pick up birds in flight, keep looking at the bird as you raise the binoculars to your eyes, then look slightly ahead of the bird, wait a moment, and hope for the best. Or you could just follow it with the naked eye and hope it lands somewhere not too far away, because identifying small birds in flight is not that easy.
7) When you've finished tracking the bird you flushed, take a good look at where it came from; there might be more there.