Taking photos of nests is not a disturbance in and of itself. There are many ways of taking photos of nests that cause little to no disturbance, indeed there are certain areas where viewing nesting birds is actually part of a combined conservation/education program (see Audubon Canyon Ranch in California for an example).
I have a nest of an Olive-backed Sunbird that I can see from my office window, the little fellow has been busy building it over the last few weeks.
There are certain protocols that need to be followed when taking photos of nests. These have been gone over in quite a bit of detail in a recent post on this specific topic:
I recommend the mods merge this post with that one in order to avoid repetition and to keep the resource pool and discussion focused.