Kyosuke
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
Certainly, “photography is prohibited,” and even at the Josho Temple, a cautionary note is posted when opening the Buddha Hall. Also, a sign saying “Photography is prohibited in the precincts” has been displayed near the entrance to the temple gate for the time being.
Permission or disapproval to photograph Buddha statues is determined within the scope of the rights of ownership and property rights of the temples, shrines, and temples that own and manage Buddha statues, and it is desirable for worshipers to follow that.
Nonetheless, whether or not you can actually comply is largely left up to the morals of the worshipers.
It's different if there is an act that is too remarkable even at a humble temple, but other than that, they almost never strongly reprimand or get angry.
However, as Kono Hideumi also said, I know that as long as we confront “sacred things,” it is still necessary to treat them with consideration as “precious things” and “things that should protect dignity” where a certain amount of “sincerity” should be required.
Of course, I think it will be necessary to think about idolatry separately.
Although Shakyamuni is not directly mentioned, it can be inferred that idol worship was probably not actively acknowledged. (“Jitomyo/ Dharma Light” in the Daehan Nirvana Sutra is often cited as an authority for this)
“Jidoshimei, Dharma Light”... see page below.
http://ja.wikipedia.org/wiki/釈迦#.E5.85.A5.E6.BB.85
However, in terms of aiming for integration with the wisdom and mercy of the Buddha on the other side through ascetic practices using Buddha statues as objects of worship, admiration, and contemplation, I also believe that there is room for recognition of idols as an aid for that purpose.
After all, the question is why something must be cherished as a “sacred thing” or “precious thing.”
This is because of the will of mercy, the Buddha saved lost and suffering sentient beings and led them to nirvana, expressed devotion to that law, and eventually went ahead with Buddhism and gained enlightenment so that I could save lost and suffering sentient beings.
I know my humble life as described above. Of course, when I was shooting, I was shown respect for the Buddha statue, so I took the picture.
Kawaguchi Hidetoshi Gassho