Not him, but I have a story for you.
I used to take shitty candids and try to record sneak video and all that dumb gay shit. I stopped when I saw a fat bearded guy in a kilt walk up to a Catwoman cosplayer and directly ask her "Can I take a picture of your butt?" She said sure, and even did an "oopsie" Coppertone girl pose, and he put that camera lens maybe a foot from her ass.
Just asking opens a lot more doors than trying to take stealth photos, and you don't even have to be overt like that guy. EBK's been getting ass pictures for years and years just asking girls "can I take a picture of the back of your costume, too?"