If someone were to be taking candid upskirt photographs, they would be violating the privacy of another person. They would also be partaking in a type of fetish activity.
A camera.
Photography.
Yes, taking pictures of someone without their consent can be illegal, depending on the circumstances and the laws in your jurisdiction. It is important to respect people's privacy and rights when taking photographs.
As long as the photos are not 'you in the nude' then there is nothing wrong with him showing you candid shots of you. If you do not like your boyfriend taking candid shots of you and feel it is invading your privacy then communicate to him how you feel about it.
Photography.
Yes, lots of them. The HST was built for taking photographs.
Yes, photographing someone without their permission can be illegal, depending on the circumstances and the laws in the specific jurisdiction. It is important to respect people's privacy and rights when taking photographs.
A camera
There are no formal requirements to becoming a wedding photographer. One must be good at taking photographs, and understanding lighting and what angles are most flattering.
There are many professional photographers who take candid images of legs. However permission must always be sought before taking any images of the subjects.
A camera.
A camera would be my first choice.