I'm sorry that I cannot read the Chinese posts on the thread, so may be slightly behind on the latest discussion.
I have been past the nest on Saturday, Sunday and Monday this week. On each occasion I have stopped and asked people to move back, expaining how their presence may result in disturbance to the nest. Most people have ignored my arguments, although some have pointed out that the birds are still visiting the nest. Nobody has moved away from the nest. I sympathise for Sze, who seems to have been intimidated by the photographers more than I have.
This morning, when I arrived, the adult bird was perched in the tree carrying food. I moved back from the nest and watched from a safe distance (probably 3-4 times the distance of the photographers!) During a period of 5 mintues, the adult remained near the nest, showing itself to be agitated by flicking its tail constantly. After 5 minutes, it actually flew away from the nest, and I think ate the food itself rather than feeding the chicks. To me, this is clear evidence that the photographers are indeed causing too much disturbance, and are risking the success of the nest. I pointed this out to the photographers, and pointed out that their actions are probably illegal (as explained by Mike above). Nobody moved.
I have now reported the case to AFCD in the hope that they may be able to take some action.
To make matters more frustrating, I personally find that the photos linked to by Katherine are not aesthetically pleasing anyway, with the subject far too large in the frame, and no context to the nest. The large cameras present should be able to take good photographs from a greater distance, and therefore not cause disturbance to the bird. Of course, at the moment I do not know who any of the photographers are, and I do not intend to point fingers in this post. I hope any members of the HKBWS would have more sense than to cause this disturbance to a wild bird, and as Katherine has pointed out there are no photos posted on this website In my opinion, it does not seem appropriate for anyone who is intentionally causing such disturbance to be a member of the bird watching society or to be allowed access into a sensitive wildlife reserve such as Mai Po.