counter hit xanga

How Does High Speed Ballistics Photography Work

by -22 views

Ballistics Photography with StopShot

Ballistics Photography

StopShot has a way defended to ballistics. When using ballistics manner the cross beam sensor is required. Our cross beam sensors allow you to get incredible placement accuracy of the projectile you are trying to capture. StopShot makes ballistics easier than e’er. To use StopShot’s ballistics mode all yous need to exercise is identify the sensors a known distance apart and set the distance multiplier in StopShot. For example: If the sensors are 6 inches apart and the distance multiplier configured to ane, you would set your photographic camera to accept a photo at half dozen inches from the last sensor. That is where the projectile will be. No more guessing the velocity and trying to summate the distance from the sensor where the projectile will be. This method takes all of the frustration out of ballistics photos. The trickiest function of ballistics then becomes lining upward the sensors and getting the flash fast enough to terminate the action. Every bit you can see from our demo pictures we were able to consistently capture a pellet buried inside something as pocket-size as an M&M (apparently, not the larger peanut variety).

Cross Beam Sensors Mounted on Ballistics Platform

The fixture shown to the left was designed to make aligning the sensors with the projectile easier. The sensors are exactly six inches apart. Each of the four corners has an adjustable pes on it for fine adjustments up and down. This fixture is very simple to make and it saves a lot of time. No more than trying to find just the right shim to get the sensors to line up with the projectile.

We used a 1/4″ Tee nuts like this to make the feet adjustable. The anxiety are only i/4″ x three” carriage bolts.

Tee Nut for ballistics fixture

The Ultimate in Precision

The pictures below are ii sequent photos of a pellet moving at nearly 300 ft/due south taken with a 100 mm macro lens and a prototype flash nosotros are working on. The scale is in centimeters (small-scale tick marks are mm). With the ballistics mode in StopShot it is very easy to precisely place the projectile where yous want it for your photo. If yous have always played with ballistics photos and air guns you know how much the speed of the pellet tin can vary from shot to shot. With ballistics mode this variation is compensated for by StopShot.

Why practise I need to fire the flash instead of the camera when doing ballistics photography?

The short respond is shutter lag. Shutter lag is the fourth dimension betwixt when the camera is triggered and when the camera really takes the image. This lag tin be 250mS or longer with some cameras. Even the latest DSLR cameras have shutter lags around 50mS or 50/1000 southward. To put this in perspective, an air pellet moving at 900ft/s volition move 45 ft in the 50mS it takes for your photographic camera to reply to the trigger it gets. This puts your photographic camera 45ft down range from where the pellet is fired – pretty inconvenient to say the least. On the other manus a wink fires only virtually instantaneously. And so we can become around the tiresome response time of the camera by leaving the shutter open in a darkened room and firing the flash when projectile is detected by StopShot. This method gives united states of america the response time needed to go consistent shots of projectiles. One concluding note about shutter lag specially for Canon shooters and that is the lag is not consistent, the amount of lag can depend on the time since the last shot or since the last half press. This makes for not only as well much lag but as well much variability.

StopShot Studio – Ballistics

Ballistics photography can be tricky. In this video we use StopShot Studio and walk through the basic setup including settings, adjustments, and ways to diagnose your wink not triggering.

The Results


Posted by: