They can be 15 cm brown birds on the ground at 50 meters away, or a large white gull 200 meters away... or vice versa.
My question is basically whether it is possible just to measure the distance to the ground itself, where the bird is sitting? The ground can be anything from gravel to grass.
Yes, it is possible to target another object nearby to get a distance. This is probably the best method when trying to target tiny birds.
Best is a small rock or other solid, reflective surface. Grass, dirt and so on are soft targets and not always reliable, especially at a shallow angle.
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Joanie (Jne) K
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