Prop blur shutter speeds for aircraft and helicopters

Prop blur is always a trade-off. Go too fast and the blades freeze, go really slow and the disc looks lovely but the aircraft gets a lot harder to keep sharp.

18 August 20269 minute read

RED, WHITE and GREEN
W-3A Sokol of the Czech Air Force captured while being hurled in the back of the bucking Skyvan in 2021.

There's no magic shutter speed, as it depends on the aircraft, the power setting and the angle. There are some good places to start though, and after that it's down to your panning, which decides how many of your attempts end up as keepers. The numbers are the easy bit. Getting the panning right can take a season or so of binned shots.

Prop blur shutter speeds: quick starting points

Aircraft	Shutter speed
Warbirds and larger piston aircraft	Around 1/160s to 1/250s
Light aircraft and trainers	Around 1/80s to 1/125s
Turboprops	Around 1/250s to 1/400s
Helicopters	Around 1/80s to 1/160s

If you only want one number to remember, make it 1/160s. It sits inside two of the four ranges above and just outside a third, so it's the safest bet for a propeller aircraft you've not shot before. Take the first pass at it, then check the disc on the back of the camera and go slower if it still has obvious gaps in it (it probably will).

Starting points

The aircraft in front of you decides which end of its range you want. The gap between the two ends is only about two thirds of a stop (a full stop for helicopters), but that's enough to make a difference to the disc.

Warbirds and larger piston aircraft

1/160s to 1/250s gives you visible blur with the airframe still fairly easy to keep sharp. Drop to around 1/125s if you want a fuller disc and don't mind binning more shots to get it. Big piston engines and long blades do a lot of the work for you here, so warbirds are the easiest aircraft on this list to get a good disc from. Annoyingly, they're also the ones you least want to get wrong!

An SE5a biplane in flight, side on, its propeller blurred almost out of sight and the airframe sharp. — 1/125 on an SE5a at 360mm, the fuller disc option from the warbird section. The blades have gone completely and the airframe is still sharp. That's the balance you're after!

Light aircraft and trainers

Often slower, at roughly 1/80s to 1/125s. Many have only two blades, so a shutter speed that gives a warbird a nice full disc can leave a trainer looking like it has two sticks bolted to the front. It's worth shooting a trainer at the slow end of that range on purpose, just to see the difference.

An RAF Prefect trainer on the ground in front of a hangar, its propeller blurred into a faint full disc. — An RAF Prefect on the ground at 1/100s, f/10, ISO 125 and 114mm, added to the Slow Shutter Showcase Mission. That sits right inside the trainer range, and the prop has gone to a full disc with the airframe still sharp.

Turboprops

1/250s to 1/400s, which is fast enough that it barely feels like a slow shutter speed. Their props have more blades, so the disc fills in at a shutter speed that would freeze a two-blade trainer solid. Turboprops are the forgiving ones, so if you're learning and there's one in the display, make the most of it.

A close view of a grey Luftwaffe A400M banking against a blue sky, its propeller blades blurred. — A Luftwaffe A400M banking at 1/320s, f/7.1 and ISO 100 on a 600mm. The blades are blurred but you can still see them. That's typical of the middle of the turboprop range. Head towards 1/250s if you'd like more of a disc.

Helicopters

Roughly 1/80s to 1/160s, and this is where the keeper rate drops right off. The slower you go, the fewer shots come out sharp, and that's just maths rather than a problem with you or your camera. A longer exposure gives you more time to move, so the answer is to take more shots rather than buy a better body.

If you only remember one number

Start at 1/160s. Shoot the first pass, check the disc on the back of the camera, and if it still looks broken up, go slower. If the aircraft is soft in every shot, go a little faster until your panning settles down.

Why the number changes

Engine power

A prop at taxi power turns a lot more slowly than the same prop on a fast pass, and every number above is for the fast pass. Taxi shots often need a much slower shutter speed than any of those ranges. It's the usual reason people come home with a lovely disc on the flying shots and a taxiing aircraft full of stopped blades, all from the same afternoon.

Blade count

More blades fill more of the circle in the same exposure. A multi-blade turboprop looks good at a shutter speed that would leave a two-blade trainer showing two clear sticks, so count the blades before you pick the number.

Angle

A prop seen head on and a prop seen side on are two different problems. Head on, you're looking through the full circle and every gap shows. Side on, the disc squashes into a narrow ellipse that hides a lot. So the same aircraft at the same shutter speed can look fine from one angle and broken from another, and it's worth checking that before you decide the number was wrong.

A C-130 Hercules seen head on as it turns onto the runway, all four propellers blurred into discs. — A USAF C-130 turning onto the runway at 1/125s, f/6.3, ISO 100 and 370mm. That's half the shutter speed of the slowest turboprop number above, and it's head on, so all four full circles are on show. On the ground, start slower than you would for the same aircraft in the air.

Panning technique matters

Once you're down around 1/160s with a long lens, every small movement you make ends up in the shot. It's the same problem birds in flight gives you, except a bird hasn't published a display schedule. The good news is that panning is a physical skill, so it improves with repetition more than almost anything else in photography. No amount of new gear fixes a bad pan.

A red Comper Swift flying low, panned so the aircraft is sharp, the propeller a blur and the trees behind pulled into streaks. — 1/100 at 560mm, about a fifth of what the reciprocal rule says you can hand hold. Shots like this come down to how you stand and pan far more than the camera.

Use the lens stabilisation mode intended for panning

Many stabilised lenses have a mode that lets horizontal movement through while still correcting the vertical, and that's exactly what a pan needs. Every manufacturer gives it a different name and number, and the wrong mode will fight your pan rather than help it. Check which one yours uses at home, rather than guessing while something is taxiing out.

Set your feet for the end of the pass

The instinct is to stand square to where the aircraft is now, so you spend the whole pass winding yourself up until your shoulders stop you right as the aircraft is closest and looks best. Point your feet at where the pass will finish and unwind into the movement instead. Feet apart, elbows in, and rotate from the hips.

Pick the aircraft up early

Track it well before you press anything, so the pan is already smooth when the shutter opens. Then keep moving after the burst has finished. Stopping as you fire softens the last few shots of a sequence, and those are usually the ones where the aircraft was closest.

Shoot enough shots

At these shutter speeds not every shot is going to work, and that's what pushes a lot of people back up to a 'safe' shutter speed and a frozen prop. A low keeper rate is normal here. Shoot more, keep the ones that worked and don't worry about the rest (your delete button will get a proper workout).

A silver P-51 Mustang with a yellow nose in flight, the propeller a blurred disc and the background smeared into streaks. — 1/80s at 500mm, about two and a half stops slower than the old 1/focal-length rule says you can hand hold. The background has gone to streaks and the aircraft is still sharp, which at 1/80s takes a smooth pan.

Bright day? You may need help

At 1/160s and base ISO, bright sun will push the aperture very small, and a very small aperture on a long lens brings its own softness. You've got three options:

stopping down and taking the diffraction softness
using a small neutral density filter
using a polariser if it suits the scene

The aim is to keep the shutter speed where you want it without forcing the lens somewhere awkward. A small neutral density filter is the tidiest option of the three. Stopping down costs you sharpness you can't get back, and a polariser only helps when the scene suits one. If you're going to do this more than once a year, it's worth buying the filter.

What are you looking for?

A full disc can look beautiful, but a partial disc can work perfectly well too, whatever the purists say. What matters is whether the movement looks intentional. A disc with some structure left in it looks like a choice, whereas blades scattered at random look like the shutter speed was an accident.

Don't get so focused on the propeller that you forget the aircraft, the light and where it all sits in the shot, which is where composition comes in. A perfect disc on a soft airframe is a missed shot, and so is a perfect disc on a sharp airframe with a row of portaloos in the bottom corner.

Practise before the rare one

Pick a common aircraft that comes round several times, start at 1/160s and take far more shots than feels reasonable. Then go slower and do it again. Somewhere down there is the speed where your keeper rate falls apart, and that number is specific to you, your lens and how steadily you stand.

Kōlab's Slow Shutter Showcase and Panning Perfection Missions are great for this. Whenever someone has their Shot Recipe on, the shutter speed sits right next to their shot. Looking at other people's prop shots is far less useful when you can't see the number.

Shoot itAviation

Slow Shutter Showcase

Full discs and honest misses. Put the shutter speed in your caption so the next person can see what it took.

Everything else you set before the first display, like exposure, lenses and where to stand, is in airshow photography settings. Get all that sorted at home and the only thing left to think about on the day is the pan.