A telephoto lens on the street
The standard advice is that street photography happens at 35mm, close enough that you are part of the scene. I own one lens. It starts at 70mm.
Compression is the point
At 300mm the crossing at Asok stops being a road and becomes a set of stacked planes — the crowd, the traffic, the shophouse signage, the BTS structure, all pressed flat against each other. You cannot get that with a wide lens standing in the same place. You cannot really get it any other way.
The trade is that you lose context and you lose spontaneity. By the time you have found a subject at 300mm, framed, and focused, the moment is usually four seconds old and gone.
Practical notes
- Shoot from a footbridge. Height solves the problem of shooting through the backs of heads.
- Pre-focus on a fixed point — a crossing line, a signpost — and wait for someone to walk into it.
- Accept a 1-in-80 keeper rate and stop feeling bad about it.
There is also an ethical dimension worth naming. A long lens means people do not know they are being photographed. I keep to public space, I do not photograph anyone in distress, and if someone notices and does not want the frame, I delete it in front of them.