This episode describes how a shutter works and answers the three questions related to shutter lag, high speed two curtain shutters, and high speed flash sync.
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25
NOV
NOV
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TPB #44 – High Speed LED Flashes
Posted by: Maurice
This week’s video is about very high speed flashes and whether LED based flashes are practical at these speeds. The dominant flash in this space is the air-gap flash with it’s half microsecond flash duration it is about 100 times faster than a typical speedlite flash from Canon or Nikon. I do some calculations that try to figure out how many LEDs you would need, what kind of current you’d need to driver ...
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7
APR
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APR
In this week’s video I look at the lag introduced by using a master flash to optically trigger a slave flash. Then I look at this extra lag and see how that would impact some common high speed photography cases like photographing a moving bullet and water droplets.
* Video about measuring Flash Lag
* Video about measuring Flash Duration
* Video about the MultiFlash board
24
MAR
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MAR
This week I demonstrate how to use the Camera Axe to photograph a popping balloon. I go over some some tricks to do with the balloon to make it look more impressive, how to setup the Camera Axe software, and the setup of your camera and flash. It’s quite easy to do once you understand the basic technique.
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10
DEC
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DEC
This week I give an overview of what makes a good flash for high speed photography. Some of the important things to look for are a short flash duration, and a way to manually select the power level for the flash. Lower power levels tend to be faster so with high speed photography people usually select one of the lower power settings.
More info:
Video about the camera shutter
Video about ...
29
OCT
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OCT
TPB #18 – Faster Triggering
Posted by: Maurice
In this episode I talk about the new digital read feature in Camera Axe software that significantly reduces lag introduced with the Camera Axe.
The old method of analog reads took around 220 us and the new digital reads take around 70 us. Both of those are fast enough for most use cases, but the digital reads might help in certain cases.
You can get the new beta Camera Axe software with these changes here.
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27
AUG
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AUG
TPB #15 – Camera Shutter Sync Sensor
Posted by: Maurice
In this episode I explain what the Camera Shutter Sync Sensor can do with the Camera Axe.
One use is to alternate between two banks of flashes on each shot. This has a few potential uses. For example each bank of flashes could be setup to give different lighting to the scene. Then with two rapid shot you get the same pose with two different lighting effects. Another example would ...
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6
AUG
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AUG
This episode show how to measure shutter lag with the Camera Axe. Form more information about shutter lag check out episode #2.
The basic theory is that we trigger both a camera and a flash from the same sensor. We will delay the flash by more each time until we find how long it takes for the shutter to open.
Thanks to Ernie for asking about how to measure shutter lag ...
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23
JUL
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JUL
TPB #12 – Projectile Sensor Setup
Posted by: Maurice
This episode discusses how to assemble the projectile sensor and connect it to the Alan Sailer’s Flickr Photostream
17
JUL
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JUL