Broad-billed rollers may visit Lamma twice a year . They usually appear on April to May and September to October.Althrough they have spotted on several location in Lamma but Sok Kwu Wan Chung Mei is the most promising place to see this bird.Of course suitable timing is a must because they usually stay not longer than two weeks .
To take picture with this bird equipped with telescope-digitcam is better because this bird like stands high in tree and seldom get near the ground .

Nice pictures - there were a few dollar birds passing through in October and they also like to perch on the bamboo in the swamp above Gaia valley between Tai Peng and Pak Kok. Most of the ones I saw did not have the red bill suggesting they were immature (not juvenile!).

Incidentally - can you tell us something about the kind of equpment you use and - without giving any secrets away - what kinds of techniques you like to use to take these pictures.