I picked up the Panasonic Lumix S5IIx about eight months ago for video work, mostly interviews and a couple of short documentary segments, and I was not planning on using it for sports. Panasonic's autofocus reputation on the older S5 and S1 bodies was rough enough that I kept a second system around just for anything that moved fast. Then my daughter's track club needed someone to shoot a regional meet on short notice, my usual sports body was in for a sensor clean, and the S5IIx was what I had charged. What follows is what I actually learned across that meet and three more since, not a spec sheet rewrite.
The autofocus story actually matters here
The reason I bothered trying the S5IIx for track at all is that Panasonic finally ditched the contrast-only DFD system for phase hybrid autofocus, the first time they've put phase-detect pixels on a full-frame body. That sounds like a footnote until you've shot a relay handoff with the old DFD system, where the lens hunts back and forth trying to guess distance instead of just measuring it. The S5IIx doesn't do that anymore. Human detection locks onto a runner's torso reliably from about 15 meters out and holds through most of a 100m dash, including the moment a competitor's arm swings across the frame in lane 4.
Where it's still not perfect: pack running in middle-distance events. When four or five athletes bunch up entering the back straight, the subject-recognition box occasionally jumps to whichever runner has the most contrast against the track surface rather than staying locked on your intended subject. I've started pre-focusing on a fixed zone and using AF area small enough that I'm choosing the runner, not letting the camera choose for me. That single change fixed probably 80% of my missed frames from the first meet.
Eye and head detection works fine for sprinters coming toward you but is basically useless for throwers and jumpers, where the body is turned away from the lens for most of the motion. For shot put and discus I switch to a single-point AF area tracking the torso, not the face, and that's been far more reliable than leaving human detection on and hoping.
Burst rate, and the catch nobody puts on the spec sheet
Panasonic advertises 30 fps electronic shutter and 9 fps mechanical, and both numbers are technically true, but they come with conditions that matter a lot on a track. The 30 fps figure is AF-S only, meaning focus locks on the first frame and never moves again. For a sprinter closing distance on you at 10 meters per second, that's not usable unless you're standing far enough back that depth of field covers the whole run, which at a wide aperture on a long lens you usually aren't.
Switch to AF-C so the camera keeps refocusing through the burst, and the real number on electronic shutter drops to roughly 10 fps in my experience. Mechanical shutter holds steady around 9 fps with continuous AF regardless of mode, which is why I default to it for anything closer than about 20 meters where focus needs to keep tracking.
The bigger issue is rolling shutter. The S5IIx doesn't have a stacked sensor, so the electronic shutter reads the frame line by line at a speed that shows up as skew on fast horizontal motion, and it's worse than I expected under the metal-halide floodlights at two of the indoor facilities I've shot. Above roughly 1/1000 with electronic shutter under those lights, I started seeing faint banding on maybe one in ten frames, on top of the usual vertical-line skew on lane markers during a hard pan. Outdoors in daylight the banding disappears but the skew on verticals is still there if you whip-pan a sprinter at full extension. Mechanical shutter avoids all of it at the cost of viewfinder blackout and the lower frame rate.
| Shutter mode | Rated / real-world fps | AF behavior | Buffer (RAW, UHS-II SD) | Rolling shutter risk |
|---|---|---|---|---|
| Mechanical | 9 fps (AF-C holds) | Continuous, refocuses every frame | ~95-100 frames before slowdown | None |
| Electronic, AF-S | 30 fps rated | Locks on first frame only | ~140 frames before slowdown | Skew on fast pans, no banding risk |
| Electronic, AF-C | ~10 fps real-world | Continuous, slight lag vs mechanical | ~110 frames before slowdown | Skew plus banding under some floodlights |
| Silent (elec., low speed) | 5 fps | Continuous | Effectively unlimited on my cards | Minimal at this frame rate |
My buffer numbers come from a pair of 128GB UHS-II cards, not the fastest on the market, so a CFexpress-equipped body would clear faster, but the S5IIx only takes SD. Two full days of shooting and I never actually filled the buffer mid-race because most track events are short bursts of two or three seconds, not sustained 20-second bursts like motorsport. Where I did stall once was shooting a distance final continuously for coverage, and the camera locked up for about four seconds while it cleared the card. Worth knowing before you commit to shooting an 800m final entirely in burst.
Lens picks that actually keep up on a track
L-mount's telephoto lineup is thinner than Sony or Canon's, but what's there covers track reasonably well. I rotate between three lenses depending on what side of the infield I'm on.
| Event type | Lens I reach for | Aperture | Why |
|---|---|---|---|
| Sprints, home straight | Panasonic S 70-200mm f/2.8 | f/2.8 | Fast enough shutter headroom in low indoor light, close enough range for tight face shots at the tape |
| Distance events, backstretch | Sigma 100-400mm DG DN OS | f/5-6.3 | Reach to cover the far side without a second body position, tolerable weight for hand-holding a full race |
| Field events (long jump, high jump) | Panasonic S 24-105mm f/4 | f/4 | Close working distance, wide enough for the full arc of a jump without cropping |
| Throws (shot put, discus, javelin) | Sigma 100-400mm DG DN OS | f/5-6.3 | Safety distance from the throwing circle plus enough reach for the release moment |
The 70-200mm is the one lens I wouldn't shoot a meet without. It's the only fast native option Panasonic makes for L-mount at that range, and paired with the S5IIx's in-body stabilization it's genuinely usable down to 1/250 handheld for static shots, though I never drop shutter speed that low for anything moving. If your budget stretches further, Sigma's 60-600mm Sports lens covers everything in one body and skips lens changes between running and field events, but it's a 2.7kg lens and after four hours on a monopod my shoulder disagreed with that choice by the last event of the day.
Settings I actually dial in before the gun goes off
For sprints and hurdles I run 1/2000 minimum, usually 1/2500, at f/2.8-4, auto ISO capped at 6400 for indoor meets and 3200 outdoors. Anything slower than 1/2000 on a 100m dash and you'll catch motion blur on the trailing leg even with the body itself sharp, which is the kind of miss you don't notice until you're culling that night. For distance races I drop to 1/1000, since the pace is slower and I'd rather have the extra light for a cleaner ISO. For field events I actually want some motion in the frame, so shot put and discus get 1/1250 to freeze the implement while a hint of blur stays in the throwing arm, which reads more dynamic than a fully frozen frame.
One setting change that mattered more than I expected: switching AF sensitivity (Panasonic buries this under custom AF settings) down to the least "sticky" option for sprints, so the camera reacquires focus quickly if it briefly loses the runner behind a hurdle. Left on the default sticky setting, it held onto the wrong plane of focus for a beat too long after a hurdle clearance and I lost a whole sequence to soft frames.
After the meet, sorting four thousand frames
A single day of track shooting on burst produces more frames than any other genre I shoot. One 400m final at 9 fps mechanical is close to 400 frames on its own, and a full meet with heats, finals, and field events easily clears three or four thousand images by the time I pack up. Going through that manually in Lightroom used to eat my whole evening.
This is where imagic actually earns its place in my workflow rather than being another app I opened once and forgot. It runs its sharpness and focus scoring locally on the machine, so I point it at the day's card dump and it ranks each burst by actual focus accuracy on the runner rather than by frame position, which matters a lot when the sharpest frame of a stride sequence isn't always the third or fourth one you'd guess by eye. It also clusters near-duplicate frames from the same burst, so instead of scrolling past nine nearly identical images of a hurdler mid-air I'm looking at one representative frame per cluster with the rest tucked underneath if I want to dig further.
Because it processes everything locally with no cloud upload, it's also the one piece of my workflow I don't have to think twice about when the subjects are minors, which at a school track meet is every single frame. I don't have to worry about where four thousand photos of other people's kids are sitting on some server while I sort them.
Once I've got the culled set, I lean on the apply_my_style preset feature to get a first editing pass across the whole batch. I trained it on a set of my own previously edited meet photos (slightly warm skin tones, a bit of extra contrast to compensate for flat overcast stadium light) and it applies something close to my usual look automatically instead of me manually matching thirty finals one by one. If you want more background on how automated culling actually scores sharpness versus just guessing, this piece on how AI photo culling works covers the mechanics in more depth than I will here.
Where it doesn't quite keep up
I want to be straight about this because most gear write-ups gloss over it: the S5IIx is not the fastest tool for this job. A stacked-sensor body like an OM-1 II or a Sony A9 III reads the sensor fast enough that rolling shutter is close to a non-issue, and their continuous AF holds up at genuinely useful frame rates well past what the S5IIx manages with autofocus engaged. If sports were 90% of my work I'd probably own one of those instead.
What the S5IIx has going for it is that I already own it for video, the phase-detect AF is a real, usable upgrade over Panasonic's older bodies, and the files out of it hold up well enough in a pinch that I haven't felt the need to buy a second body just for meets. For a photographer shooting track occasionally rather than as a full-time sports specialist, that trade-off is fine. For someone shooting three meets a week where every missed frame at a state final actually costs them a sale, I'd think harder about it.
Frequently Asked Questions
Is the S5IIx fast enough to freeze a sprinter at the finish line?
Yes, at 1/2000 or faster with mechanical shutter and continuous AF you'll get clean, sharp frames through the tape. The camera itself isn't the limiting factor for sprints, your shutter speed choice and AF area selection matter more than the burst rate.
Does the phase-detect autofocus actually hold onto a runner through a crowded pack?
Mostly, but not reliably enough to trust blindly. Subject recognition can jump between runners when several are bunched together with similar contrast against the track. I get better results using a small, fixed AF area I control rather than leaving full human detection active during pack running.
What shutter speed should I use for field events like long jump or shot put?
I run 1/2000-1/2500 for jumps to freeze the takeoff, and closer to 1/1250 for throws where a touch of motion blur in the throwing arm looks more natural than a fully frozen frame. Field events generally give you more light to work with than a dim indoor sprint, so ISO isn't usually the constraint.
What's the safest way to sort and edit photos of youth athletes after a meet?
I keep the entire culling and editing pass local rather than uploading batches to a cloud service, since most meet photography involves minors and I'd rather not have thousands of their images sitting on someone else's server while I sort them. Local sharpness scoring and burst clustering get me through the pile fast enough that cloud processing was never actually necessary.