Pan Shot
A photography technique where the camera tracks a moving train at a slow shutter speed, producing a sharp subject against a motion-blurred background.
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A pan shot — short for panning shot — is the technique of moving the camera horizontally to follow a passing train while the shutter is open, so the train remains sharp but the background, foreground, and any non-train motion smear into blur. Done well, it produces one of the most kinetic images in the railfan repertoire: locomotive details remain crisp, the wheels show clear rotational blur, and the surrounding world dissolves into streaks that reinforce the impression of speed.
The technique requires committing to a shutter speed roughly an order of magnitude slower than a "freeze" exposure — typically 1/30 to 1/125 of a second for mainline freight, slower for slow-moving local power, faster for high-speed passenger sets. You pre-focus on the spot where the train will pass, start tracking it smoothly with your body and lens before pressing the shutter, and continue the motion through and after the exposure (a follow-through, as in golf or shooting). Most modern lenses offer a panning-aware image stabiliser mode that compensates for vertical movement but not horizontal — exactly what you want.
The aesthetic is divisive. Purists consider a perfectly executed wedge with frozen wheel motion to be the more disciplined image, while pan shots can hide a multitude of compositional sins behind decorative blur. Done badly, the train itself blurs and the result is just a poor exposure. Done well, it conveys speed and intent that no static frame can match.