29 September, 2018

Doc Diaries: Fuji X-T1 Mirrorless

Sometimes gear matters. My photographic journey started off with a point-and-shoot camera, about 16 years ago, and has since been powered predominantly by some combination of DSLRs and (more recently) mirrorless cameras.

As I developed as a photojournalist, and subsequently as a documentary photographer, I found myself optimizing for two competing usecases: I wanted a camera I could keep with me, because some of the best opportunities are unexpected and unpredicted. But I also wanted to be able to cover large events (like concerts and athletic events), while wearing gloves, where my movement might be constrained, without needing to change lenses.

Over the years, my kit has bifurcated into a pair of solutions that handle those two kinds of situations separately. For everyday moments and unexpected situations, I have a Fuji X-T1 mirrorless camera with a fairly compact 27mm f/2.8 prime lens that's with me most of the time. The whole package is sufficiently convenient that I carry it even on days when I expect no pictures to happen. In contrast, when I go somewhere for the purpose of shooting, I'll usually bring a pair of D7100 DSLR bodies with f/2.8 zooms attached. I still have plenty of frustrations with both setups, but even so, I still find myself able to work pretty effectively.

Finally, to put this post (and this series) into some context, I picked up the X-T1 in 2014 and have run a bit over 28k frames through it since then. The D7100 bodies are at ~92k for the pair. Previously, I had put ~118k frames onto two D300 bodies, ~23k frames onto a Sony NEX-7 and NEX-6, ~11k frames onto a Fuji X100, and ~50k frames onto the Nikon D70 that started it all for me. Suffice it to say that I have a significant amount of experience with all of these cameras, and all of the conclusions I draw are specifically against this backdrop. I'm well aware that other cameras (whether mirrorless or DSLR) have different strengths and weaknesses.

28 August, 2018

Photographic Problem Solving: Rolling Shutter in Two Shots

First and foremost, I'm a pole vaulter who trains with decathletes. So when they switch to training for a different event, I switch to my camera, to try to capture a bit of what it's like to be a non-elite, post-collegiate athlete in the US.

My everyday camera is a Fuji X-T1, a mirrorless camera that can shoot either with the mechanical focal-plane shutter, or with an electronic-only silent shutter mode. By default, it will shoot with the mechanical shutter up to the 1/4000s maximum, and then switch to the electronic shutter up to a final max of 1/32000s. That's super useful for me, because I love to shoot at relatively open apertures (to control depth-of-field) in very bright sunlight. Also, sometimes I'll try to expose for a silhouette in bright sunlight, while still keeping DoF in check. In either case, the aperture is locked, I'm at base ISO, and shutter speed is all I've got left.

During one particular shot put practice, I exposed for a silhouette as my training partner Dan took two throws. Of my various images that day, I took images of the two throws with the first at 1/4700s (shown above, with the electronic shutter), and the second at 1/3500s (with the mechanical shutter, shown below).

31 July, 2018

Power versus Efficiency (Footwork, part 4)

There are two ways to fly in track and field. We covered "up" last time, with the vertical jumps. The other way is "out." The horizontal jumps are all about distance, and a close look at footwork and body position can provide some clues as to what's important and why.

First and foremost, long jump and triple jump seem pretty similar at first, but it's amazing the difference that two extra hops can make. When you look at the sprinting events, it's fairly common for elite athletes of both genders to turn in great performances for similar distances (for instance, 100m dash and 200m dash, or 200m dash and 400m dash). Likewise, in the distance events, 5k/10k doubles are also common across both genders.

By contrast, there's only one athlete in each gender who shows up in the top 25 for both long jump and triple jump performances. From a high-level perspective, one hypothesis is that the long jump favors power, whereas the triple jump rewards efficiency, and it's difficult for a single athlete to do both power and efficiency extraordinarily well.

21 July, 2018

Perchance, To Fly (Footwork, part 3)

The jumps are just like the throws, except this time, your goal is to fly. But just like with the throws, athletes combine specialized footwear with finely-honed footwork to make that magic happen.

All four jumping events share a pretty basic pattern: first you run, and then you jump. The four events break down into two major categories: the horizontal jumps (long jump and triple jump) and the vertical jumps (high jump and pole vault).

The horizontal jumps are all about taking a limited number of attempts and achieving the furthest distance from a set limit line ("the board"). As with the javelin, if you take off from past the board, you foul the jump and your distance doesn't count. But if you jump from behind the board, the room you leave to spare doesn't count toward your total. So the name of the game is to jump from as close to the edge of the board as you can, without going over.

The vertical jumps differ in that you have an unlimited number of attempts to jump as high as you can. You are eliminated from the competition after you miss three consecutive attempts. If you clear extra height over a low crossbar, that doesn't help your total — style points don't count — but if you pass to a height that you can no longer clear, then your last cleared height is your final measurement. So the risk-balancing aspect is still present, but it has more to do with fatigue and technical repetition than with the ability to hit a precise mark on the ground.