Pocket Wizard or better value for the money: Hahnel Capture.
It is an interesting image. For sure.
Martin, the peoples you have on the image, are that Muslims? Muslims have an issue with being photographed, and I believe it is they're right not liked to be photographed.
For myself, I decided to stop shooting if it is clearly not allowed or if peoples not allow to be photographed. This personal decision has to see with European privacy regulation and the lack of local complementary regulation. In certain European countries, we (non journalist photographers) have notting legal in hand to cover GDPR and privacy regulation.
Apart from a legal constraint, I also believe we (photographers) should have an ethical conduct. I'm not sure if taking sneaky shots is still within my ethical code.
I think there is a difference in taking a shot on the street with peoples, maybe not aware of the picture taken, and going into a room where it is not allowed to shoot, and take pictures with kind of spionage techniques.
I recently had a discussion with a third generation immigrant muslim who made objection because I was shooting on the street with my GRII, not concealed, but from the chest. It was a very cumbersome discussion with no outcome, but it made me thinking. Although I found his arguments an example of clashing cultures, I put myself in his place and by doing so, I could see some reasonability in his arguments, arguments not from a photographers point of view, but from a person on the streets view. That's where I started to rethink my ethical code.
There is a paradigma shift ongoing in the western collective mind set. Few days ago, a girl posted a videoclip on instagram. Some militants of the communist party burning a flag of the nationalist Flemish party. The president of that nationalist party reposted this video, including the girls insta account name, on twitter. Huge consternation, a president of a political party was doxxing a young girl.
Some say: what's the problem? The girl posted the video in first place, she could expect somebody reposting it.
A Belgian university professor was asked his opinion and in short he said: The president of the national party infringed the girl's privacy because by reposting the instagram message, he stole the girls control over here social media content........
That's where we are going, and we should better deal with it, I'm afraid.
Ivo