![\"detail](\"https:\/\/wading-in.net\/walkabout\/wp-content\/uploads\/2019\/05\/TbirdsFavoriteDetail.jpg\")
So you wanna capture something fast, huh? It can be trickier than you think, so here are a few things to know and how to cope with them.<\/p>\n
So you wanna capture something fast, huh? It can be trickier than you think, so here are a few things to know and how to cope with them.<\/p>\n
The very first thing is, the shutter curtains (the things that actually expose and re-conceal the sensor\/film) are mechanical on most cameras and can only move so fast. It varies depending on the camera type and age, but for most modern DSLRs, they can uncover the sensor in roughly 1\/300 second.<\/p>\n
“But my<\/em> camera goes all the way up to 1\/8,000 second shutter speed!” you may protest, and this is true – in a way. Any given portion of the sensor only receives light for 1\/8,000 second, but not all of it at the same time<\/em>. Because of this mechanical speed limitation, there are two sets of curtains, both moving in the same direction:<\/strong> one uncovers the sensor\/film, and the other follows behind to cover it back up again. That gap between these two actions is your set shutter speed, but it may still take 1\/300 second or longer to fully expose the sensor\/film as this gap between curtains travels across the image plane. Often called a ‘rolling shutter’ but more specifically a ‘focal plane shutter,’ it’s also the way most smutphones capture images and why faster subjects often look wildly distorted.<\/p>\n It’s also why there’s a flash sync speed listed as 1\/250, 1\/200, or less for older cameras, because that’s the highest shutter speed they can manage where the entire image plane will be exposed to the flash burst. Many camera and flash combos can do faster, but it’s by actually firing off multiple bursts from the flash in time with the shutter curtains’ movement, to account for the whole image plane. This very often needs to be set specifically, and may be called ‘high-speed’ or ‘focal plane’ (FP) flash. It also can limit the flash distance, because they work by charging a capacitor for the very high voltages needed to trigger the xenon tube, and the capacitor only holds so much charge. The more times it has to fire, the weaker these individual flashes become, so for very high shutter speeds, the flash is affective for much less distance than normal, sometimes only a couple of meters.<\/p>\n The first is, shoot from a greater distance so that the subject’s apparent motion is reduced commensurately – it only has time to move across a much smaller portion of the frame. This can be of limited usefulness, however, in that you will often want to crop down and blow the subject up more, and so the now-magnified motion may still be apparent. With a subject moving in a singular manner though, such as a race car passing by, you can pan with the movement, and if you’re accurate enough, the subject remains centered in the frame and relatively distortion-free, though the background will probably be blurred, and in most cases this is okay and even a better composition, imparting a distinct impression of the speed. This combined with a greater working distance makes it easier to pan and can produce great results.<\/p>\n This does not work with propellers or hummingbird wings, or anything that isn’t moving in a single direction. It also is extremely difficult to do with something moving very fast. Which brings us to another interesting technique, but only in limited conditions, and that it, using the flash as the shutter.<\/p>\n Flash\/strobe bursts are very fast, usually in the order of 1\/1000 to 1\/10,000 of a second, so they’re capable of ‘freezing’ very fast motion all by themselves. As long as they are the primary light source for the image, they can serve to produce the exposure, and the shutter speed can stay much lower than what would normally be needed. This really means either studio work, or outside at night. Usually, it also means setting the camera for Manual, because it might otherwise be trying to compensate for the slower shutter speed and\/or the aperture setting.<\/p>\n Your flash can also be triggered in other ways, such as electronically. While there may be a lot of contacts between the flash and camera, virtually all of those used on a hot shoe mount have the same basic trigger:<\/strong> short the center contact to the upper shoe mount (usually on one side within the groove on the mounting shoe.) The flash provides all the power, so just connecting these two together will fire off the flash at full power. It’s easy enough to make a hand trigger, or a sound sensor device, or a light beam device, since all they have to do is close a relay between these contacts. Be warned, however:<\/strong> older flash units occasionally throw a lot<\/em> of voltage into these, in excess of 300 volts, so not only do your electronic devices have to be able to handle this (and keep it isolated from more delicate components,) you won’t want to chance having that voltage pass through you<\/em>. I’ve done this before, with relatively small flashes from disposable film cameras, and while it’s not dangerous per se<\/em>, it’s a hell of a bite.<\/p>\n While I’ve never attempted this myself, I’ve read about how photographers captured photos of a bullet in midair. Considering that it would cross the frame in milliseconds, timing had to be precise, and they used a flash triggered by the sound of the gun discharging – but they also had to calculate the speed of sound, the speed of the bullet itself, and the delay that the electronics presented to know just how far away the camera had to be aimed. Since the speed of the bullet was only fractionally different from the speed of sound in the first place, the microphone was placed right by the gun barrel, while the electrical signal through wiring from it and further through the triggering device was actually faster than this. Still, beyond my abilities to suss out, but it illustrated how much had to be considered.<\/p>\n feel free to experiment – just, understand what the camera cannot do and why, and how to work around it if possible.<\/p>\n So you wanna capture something fast, huh? It can be trickier than you think, so here are a few things to know and how to cope with them. The very first thing is, the shutter curtains (the things that actually expose and re-conceal the sensor\/film) are mechanical on most cameras and can only move so […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,11],"tags":[311,4281,4280,6816,4282,3445,3444,8916,8917],"class_list":["post-42740","post","type-post","status-publish","format-standard","hentry","category-photo","category-reference","tag-flash","tag-flash-sync","tag-focal-plane-shutter","tag-freezing-action","tag-high-shutter-speed","tag-motion-blur","tag-panning","tag-rolling-shutter","tag-stopping-action"],"_links":{"self":[{"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/posts\/42740","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/comments?post=42740"}],"version-history":[{"count":5,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/posts\/42740\/revisions"}],"predecessor-version":[{"id":42746,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/posts\/42740\/revisions\/42746"}],"wp:attachment":[{"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/media?parent=42740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/categories?post=42740"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wading-in.net\/walkabout\/wp-json\/wp\/v2\/tags?post=42740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Republic](\"https:\/\/wading-in.net\/walkabout\/wp-content\/uploads\/2018\/02\/768px-Thunderbolt_II_30_Sqn_RAF_at_Jumchar_1945.jpg\")
This also means that, for high shutter speeds in ambient light, fast moving subjects are moving while the shutter curtains are, and appear in different locations as it moves. Propellers get bent wildly, race cars appear slanted, and so on. There is very little than can be done about this, since it’s an inherent trait of the camera. Those few cameras that have iris shutters, however, can often manage faster shutter speeds because they uncover the image plane from the center outward, but they usually have a limit much slower than modern SLRs because the same iris blades have to close again, so this isn’t a fix. Then, what is?<\/p>\n![\"ice](\"https:\/\/wading-in.net\/walkabout\/wp-content\/uploads\/2018\/02\/Freeze.jpg\")
This technique may take a little practice, and certainly can require a lot of tries to get perfect timing down. Definitely, a darker background helps a lot. The darker the overall area is, the longer you can leave the shutter open and only concentrate on triggering the flash, off-camera and manually operated with the ‘Test’ button, at the crucial moment. of course, the darker it is, the harder it is to know<\/em> when the crucial moment is. There’s always something in the way…<\/p>\n![\"water](\"https:\/\/wading-in.net\/walkabout\/wp-content\/uploads\/2026\/10\/FountainDrops.jpg\")
<\/p>\n","protected":false},"excerpt":{"rendered":"