Photo — Low light
#photo/lowlight · Note 3 of 7 · part of Photography
Everything here follows from one fact: the R50 has no in-body stabilisation. All the stabilising comes from the lens, and the RF 35mm f/1.8 has good Hybrid IS — roughly five stops. So:
Static subjects: excellent. Moving subjects: ordinary. IS stabilises the camera. It has never once stabilised a subject.
Static subject — a room, a street, a still life
IS is doing the work, so the shutter floor drops a long way below the usual 1/60 from Photo — Exposure, plainly:
- f/1.8
- 1/15s, or slower — I have had sharp frames at 1/8s braced against a wall
- ISO 800–3200
Brace against something. Breathe out, then shoot. Take three; one will be sharp.
Moving subject — people, a room with life in it
IS is now irrelevant and the shutter has to do it alone:
- f/1.8
- 1/125s minimum for someone talking; 1/250s if they are walking
- ISO 3200–6400, and accept it
This is the trade nobody likes: you cannot have a sharp moving subject in a dark room at low ISO. Something has to give, and it should be the ISO — noise is recoverable, motion blur is not.
The Auto ISO setup I actually use
- Mode: Av at f/1.8
- Auto ISO, ceiling 6400
- Minimum shutter speed set manually — 1/60 for still scenes, 1/160 when there are people in the frame
Two dial changes cover almost everything.
Noise is a solved problem, mostly
Shoot RAW. Modern denoise — Lightroom's AI Denoise, DxO PureRAW, Topaz — takes ISO 6400 to something that looks like ISO 1600, and it is genuinely remarkable. It cannot invent detail that motion blur destroyed.
This is why the rule is raise ISO, protect shutter speed.
Focus in the dark
The R50's Dual Pixel AF is very good in low light, but at f/1.8 up close the depth of field is millimetres. Two habits:
- Eye detection on, always, for people
- One Shot for static subjects, Servo the moment anything moves
If AF hunts, it is usually a contrast problem — aim at an edge, not a flat wall.
When to give up and use a tripod
If the subject is not moving, a tripod removes the entire problem: ISO 100, f/5.6, whatever shutter you like. That is also the doorway to Photo — Night sky.
Turn IS off on a tripod. A stabiliser with nothing to correct can hunt against itself and soften the frame.
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