I tried to visit Kailash zone 4 years ago, crossing border from Nepal, and there was not problem with my equipment: 2 Canon EOS
1 with lenses, really big. And in Lhasa, well, at least some parts of city were not allowed to go, specially the tibetan areas, police can “invite” you to go to the tourist fake places. There is another parts of Tibet not very known that you can visit with no big problems.
If you want to go solo and off the beaten path, then go to the Tibetan areas outside the TAR
. Go do a kora around Amnye Machen in Qinghai — beautiful, in a remote area, nomads around, difficult hiking, very sacred to Tibetans. Don’t need any permits to go there.
I dont know the situation now, I suppose no changes. But, never a big problem with large photo-equipment.
Inmigration police can be very heavy, but finally, you will not have problems.