Difference between revisions of "Understanding HyperSync and High Speed Sync"

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(What results can I get with my camera and flash?)
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A flash is designed to emit a very intense light for a short duration of time. This is done by filling a flashtube with xenon gas, and then using a charged capacitor to energize the xenon with a very high amount of electrical current.
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A flash is designed to emit a very intense light for a short duration of time. This is done by filling a flashtube with xenon gas, and then using a charged capacitor to energize the xenon with a very high amount of electrical current. The peak has the highest amount of energy emitted (hence the name, "peak") but energy continues to be emitted at a decreasing rate so long as the xenon gas is energized.
  
  
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A camera triggering a flash at X-sync follows this time-line:
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A camera triggering a flash at X-sync follows this timeline:
 
#The camera is triggered by the photographer.  Several milliseconds of Lag Time pass. The amount of lag time varies from camera to camera.
 
#The camera is triggered by the photographer.  Several milliseconds of Lag Time pass. The amount of lag time varies from camera to camera.
#The first shutter opens, exposing the digital sensor.  Some microseconds of time pass.  This shutter will stay open for several milliseconds when the camera is set to its X-Sync speed.
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#The first shutter opens, exposing the digital sensor.  Some microseconds of time pass.  This shutter will stay open for several milliseconds.
 
#The camera triggers its PC terminal and the center sync pin on the hot shoe.
 
#The camera triggers its PC terminal and the center sync pin on the hot shoe.
#Some microseconds of time pass, then the flash begins to emit light.
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#A few more microseconds of time pass, then the flash begins to emit light.
#The flash emits light for the its flash duration.  This can be any amount of time up to a few milliseconds. A
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#The flash emits light for the its flash duration.  This can be any amount of time up to a few milliseconds.  
 
#The second shutter in the camera closes and both shutters reset.
 
#The second shutter in the camera closes and both shutters reset.
  
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Users of the [[PlusX]], [[Plus III]], or [[MultiMAX]] can select [[Transmit Only]] on their transmitter to use a smaller delay, as well as using [[Plus_III#Modes_of_Operation|Receive Only]] on a [[Plus III]] to have the fastest transmission possible.
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Users of the [[PlusX]], [[Plus III]], or [[MultiMAX]] can select [[Transmit Only]] on their transmitter to use a smaller delay, as well as using [[Plus_III#Modes_of_Operation|Receive Only]] on a receiving [[Plus III]] to have the fastest transmission possible.
  
 
== [[High Speed Sync]] ==
 
== [[High Speed Sync]] ==
  
High Speed Sync (HSS), also known as Auto FP Sync, is a speedlight-only technique allows for triggering at shutter speeds faster than X-Sync. "FP" stands for "Focal Plane." When the first shutter starts to open, it is exposing the digital sensor, which is the Focal Plane. FP Sync means triggering the flash just before the focal plane is exposed rather than waiting until shutter is fully open.
+
High Speed Sync (HSS), also known as Auto FP Sync, is the camera manufacturer's speedlight-only technique allows for triggering at shutter speeds faster than X-Sync. "FP" stands for "Focal Plane." When the first shutter starts to open, it is exposing the digital sensor, which is the Focal Plane. FP Sync means triggering the flash just before the focal plane is exposed rather than waiting until shutter is fully open.
  
  
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HSS/Auto FP uses a pulsed light technique that generates continuous light from before the first shutter begins to move until after the second shutter closes. At faster shutter speeds, both the first and second shutters are moving simultaneously, creating a moving slit across the digital sensor. Since the light appears continuous to the digital sensor, there is no clipping even at the fastest shutter speeds.   
+
HSS/Auto FP uses a pulsed light technique (instead of a normal single burst) that generates continuous light from before the first shutter begins to move until after the second shutter closes. At faster shutter speeds, both the first and second shutters are moving simultaneously, creating a moving slit across the digital sensor. Since the light appears continuous to the digital sensor, there is no clipping even at the fastest shutter speeds.   
  
  
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== [[HyperSync]] ==
 
== [[HyperSync]] ==
  
A normal, non HSS-Auto FP flash duration is much more efficient at delivering light to a subject than an HSS/Auto-FP or pulsed flash method. You can have your flash farther from a subject, or deliver more light to the scene when using a normal flash, and use flashes that aren't even capable of pulsing light as required for HSS/Auto-FP.
+
A normal, non HSS-Auto FP flash duration is much more efficient at delivering light to a subject than an HSS/Auto-FP or pulsed flash method. You can have your flash farther from a subject, or deliver more light to the scene when using a normal flash, as well as use flashes that aren't even capable of pulsing light as required for HSS/Auto-FP.
  
 
HyperSync uses special information available in the TTL shoe pins to trigger a normal flash ''before'' X-Sync would occur.  It does this by knowing how much time passes from these communications until X-sync. It can also eliminate the delay introduced by a radio slave. This is different from the "HSS hack" in that the timing is both adjustable, and can be optimized for some flashes.  
 
HyperSync uses special information available in the TTL shoe pins to trigger a normal flash ''before'' X-Sync would occur.  It does this by knowing how much time passes from these communications until X-sync. It can also eliminate the delay introduced by a radio slave. This is different from the "HSS hack" in that the timing is both adjustable, and can be optimized for some flashes.  
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* You'd be using this optimized tail HyperSync '''automatically''' by choosing [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]] if you chose this option on the [[HyperSync/HSS Tab]] using a ControlTL receiver.
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* You'd be using this optimized tail HyperSync '''Automation''' by choosing [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]] if you chose this option on the [[HyperSync/HSS Tab]] using a ControlTL receiver. This is the factory default setting.
 
* You'd be able to use [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]]-style HyperSync '''manually''' with a FlexTT5 connected to your flash as a receiver by following the directions for the [[HyperSync#FlexTT5 - Flash Connected to P2 Port|FlexTT5 P2 Port]] and trying to eliminate clipping at your '''highest''' shutter speeds.
 
* You'd be able to use [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]]-style HyperSync '''manually''' with a FlexTT5 connected to your flash as a receiver by following the directions for the [[HyperSync#FlexTT5 - Flash Connected to P2 Port|FlexTT5 P2 Port]] and trying to eliminate clipping at your '''highest''' shutter speeds.
 
* You can attempt to use [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]]-style HyperSync '''manually''' with a radio receiving on a [[Channels#Standard Channels|Standard Channel]] (meaning a ([[Plus II]], [[Plus III]], [[PlusX]], [[MultiMAX]], [[Misc_Tab#Basic_Trigger|FlexTT5 in Basic Trigger Mode]]), or internal PocketWizard receiver built in to your flash.) This is done by following the directions for the [[HyperSync#PocketWizard Radio Receiving on a Standard Channel|PocketWizard Radio Receiving on a Standard Channel]] section, and trying to eliminate clipping at your '''highest''' shutter speeds.
 
* You can attempt to use [[Understanding HyperSync and High Speed Sync#Reduced Clipping|Reduced Clipping]]-style HyperSync '''manually''' with a radio receiving on a [[Channels#Standard Channels|Standard Channel]] (meaning a ([[Plus II]], [[Plus III]], [[PlusX]], [[MultiMAX]], [[Misc_Tab#Basic_Trigger|FlexTT5 in Basic Trigger Mode]]), or internal PocketWizard receiver built in to your flash.) This is done by following the directions for the [[HyperSync#PocketWizard Radio Receiving on a Standard Channel|PocketWizard Radio Receiving on a Standard Channel]] section, and trying to eliminate clipping at your '''highest''' shutter speeds.
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* You'd be using this optimized [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]] HyperSync '''automatically''' by choosing [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]] if you chose this option on the [[HyperSync/HSS Tab]] using a ControlTL receiver.
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* You'd be using this optimized [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]] HyperSync '''Automation''' by choosing [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]] if you chose this option on the [[HyperSync/HSS Tab]] using a ControlTL receiver.
 
* You can use [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]]-style HyperSync '''manually''' with a non-ControlTL compatible flash by using a FlexTT5 connected to your flash as a receiver by following the directions for the [[HyperSync#FlexTT5 - FlexTT5 - Flash Connected to P2 Port|FlexTT5 P2 Port]] and trying to put the most flash energy in the frame at '''lower''' HyperSync speeds without "clipping" visible at the bottom of your frame.
 
* You can use [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]]-style HyperSync '''manually''' with a non-ControlTL compatible flash by using a FlexTT5 connected to your flash as a receiver by following the directions for the [[HyperSync#FlexTT5 - FlexTT5 - Flash Connected to P2 Port|FlexTT5 P2 Port]] and trying to put the most flash energy in the frame at '''lower''' HyperSync speeds without "clipping" visible at the bottom of your frame.
 
* You can attempt to use [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]]-style HyperSync '''manually''' with a radio receiving on a [[Channels#Standard Channels|Standard Channel]] (meaning a [[Plus II]], [[Plus III]], [[PlusX]], [[MultiMAX]], [[Misc_Tab#Basic_Trigger|FlexTT5 in Basic Trigger Mode]]), or internal PocketWizard receiver built in to your flash.) This is done by following the directions for the [[HyperSync#PocketWizard Radio Receiving on a Standard Channel|PocketWizard Radio Receiving on a Standard Channel]] section, and trying to put the most flash energy in the frame at '''lower''' HyperSync speeds without "clipping" visible at the bottom of your frame.
 
* You can attempt to use [[Understanding HyperSync and High Speed Sync#Highest Energy|Highest Energy]]-style HyperSync '''manually''' with a radio receiving on a [[Channels#Standard Channels|Standard Channel]] (meaning a [[Plus II]], [[Plus III]], [[PlusX]], [[MultiMAX]], [[Misc_Tab#Basic_Trigger|FlexTT5 in Basic Trigger Mode]]), or internal PocketWizard receiver built in to your flash.) This is done by following the directions for the [[HyperSync#PocketWizard Radio Receiving on a Standard Channel|PocketWizard Radio Receiving on a Standard Channel]] section, and trying to put the most flash energy in the frame at '''lower''' HyperSync speeds without "clipping" visible at the bottom of your frame.
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* Flash duration often changes with power level.  When you are fine-tuning HyperSync, make sure to test across the flash power levels you intend to use so you can see if certain flash durations will cause clipping at any shutter speed you intend to use. For a great comparison of how important flash duration is, see the 5D Mark II results for HyperSync with a Ranger RX Pack with an S head, and the results with a Ranger RX Pack with an A head. It's the same pack, same camera, but the flash duration is much, much shorter with the A head, and has a very noticeable visual effect. You can see these images on our [[HyperSync#White Wall vs. Real World|Camera HyperSync results page]].
+
* Flash duration often changes with power level.  When you are fine-tuning HyperSync, make sure to test across the flash power levels you intend to use so you can see if certain flash durations will cause clipping at any shutter speed you intend to use. For a great comparison of how important flash duration is, see the 5D Mark II results below for HyperSync with a Ranger RX Pack with an S head, and the results with a Ranger RX Pack with an A head. It's the same pack, same camera, but the flash duration is much, much shorter with the A head, and has a very noticeable visual effect. You can see these images and more on our [[HyperSync#White Wall vs. Real World|Camera HyperSync results page]].
  
  
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=== Shutter Blade Travel Rate ===
 
=== Shutter Blade Travel Rate ===
  
* Cameras with larger and slower shutter blades will make HyperSync less likely to work without noticeable gradation. Faster shutter blades, smaller sensors, or crop mode can often improve HyperSync success by minimizing gradation.  
+
* The shutter blade travel rate is the time it takes the curtains to physically move from the top of the sensor to the bottom of the sensor. This is not your camera's shutter speed setting. Cameras with larger and slower shutter blades will make HyperSync less likely to work without noticeable gradation. Faster shutter blades, smaller sensors, or crop mode can often improve HyperSync success by minimizing gradation.  
  
  
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=== Camera Communication Time ===
 
=== Camera Communication Time ===
  
* Some cameras communicate up through their shoe to give the radios a larger window of opportunity for adjustment, resulting in no "clipping" at the bottom of the frame, and some do not, resulting in "clipping" at the bottom of the frame.
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* Some cameras send signals up through their hot shoe before x-sync sooner than others. This gives the radios themselves a larger window of opportunity for adjustment, resulting in no "clipping" at the bottom of the frame, and some do not, resulting in "clipping" at the bottom of the frame.
  
  

Revision as of 07:22, 14 June 2013

Next recommended reading: HyperSync


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This section discusses HyperSync and High Speed Sync at a basic level. Read the HyperSync section for more detailed information on how to adjust HyperSync for your configuration.

This page details how flashes function when triggered with HyperSync, High Speed Sync (or Auto FP), and at your camera's sync limit, or its x-sync speed.

HyperSync and High Speed Sync/Auto-FP are not the same thing, and it's important to understand the differences as to how each method relates to your setup.

How Does a Flash Work?

A flash is designed to emit a very intense light for a short duration of time. This is done by filling a flashtube with xenon gas, and then using a charged capacitor to energize the xenon with a very high amount of electrical current. The peak has the highest amount of energy emitted (hence the name, "peak") but energy continues to be emitted at a decreasing rate so long as the xenon gas is energized.


Typical flash duration simulation - Ranger RX pack with the S head at full power
Typical flash duration simulation - Ranger RX pack with the S head at full power


While appearing to flash on and instantly turned off again, a flashtube can be excited for anywhere from 1 microsecond to tens of milliseconds. Most consumer flashes usually average around 1 millisecond, with some being longer, and some being shorter.

X-Sync - Flash behavior with normal sync limits

A flash directly connected to a camera

X-Sync is typically the fastest shutter speed at which your camera can trigger a flash. For most Canon cameras, this is 1/200th. For most Nikon cameras, this is 1/250th, except for a few exceptions like the D600.


A camera triggering a flash at X-sync follows this timeline:

  1. The camera is triggered by the photographer. Several milliseconds of Lag Time pass. The amount of lag time varies from camera to camera.
  2. The first shutter opens, exposing the digital sensor. Some microseconds of time pass. This shutter will stay open for several milliseconds.
  3. The camera triggers its PC terminal and the center sync pin on the hot shoe.
  4. A few more microseconds of time pass, then the flash begins to emit light.
  5. The flash emits light for the its flash duration. This can be any amount of time up to a few milliseconds.
  6. The second shutter in the camera closes and both shutters reset.



Shutter speeds faster than X-Sync typically have the first and second shutters moving at the same time, or with no delay between the first shutter fully opening and the second shutter beginning to close. This does not work with normal flash triggering because the second shutter can be moving when the flash is generating light which yields a clipped exposure.



If your flash has a very long duration, or your shutter is very slow moving, you can get clipping even at X-sync.

A flash triggered remotely by a standard radio slave

Standard radio slaves can introduce bottom-frame shutter shadowing, or "clipping" in your image even at your camera's sync limit. 5D Classic 1/200th


Adding a standard radio slave to the above time line adds additional microseconds between steps 3 and 4. This additional delay moves the flash triggering moment towards the time when the second shutter will be moving. If your flash has a very long duration, or your shutter is very slow moving, you can get clipping when using a standard radio slave even at X-sync. You may have to use a slower shutter speed.


Users of the 5D series of cameras have especially noticed this, as evidenced by the example to the right.


Users of the PlusX, Plus III, or MultiMAX can select Transmit Only on their transmitter to use a smaller delay, as well as using Receive Only on a receiving Plus III to have the fastest transmission possible.

High Speed Sync

High Speed Sync (HSS), also known as Auto FP Sync, is the camera manufacturer's speedlight-only technique allows for triggering at shutter speeds faster than X-Sync. "FP" stands for "Focal Plane." When the first shutter starts to open, it is exposing the digital sensor, which is the Focal Plane. FP Sync means triggering the flash just before the focal plane is exposed rather than waiting until shutter is fully open.


HSS Pulses at various shutter speeds within the Canon Optical communications system
HSS Pulses at various shutter speeds within the Canon Optical communications system


HSS/Auto FP uses a pulsed light technique (instead of a normal single burst) that generates continuous light from before the first shutter begins to move until after the second shutter closes. At faster shutter speeds, both the first and second shutters are moving simultaneously, creating a moving slit across the digital sensor. Since the light appears continuous to the digital sensor, there is no clipping even at the fastest shutter speeds.


HSS/Auto FP requires a special flash like a Canon Speedlite or Nikon speedlight that can do the pulsed light technique. Studio strobes are not capable of pulsing light, a requirement for HSS/Auto FP. This method also requires special timing information from the camera that happens between the user pressing the shutter button and the camera's sensor opening. This information is communicated through the TTL pins of a camera's hot shoe. A normal studio flash or standard non-TTL flash cannot perform the light pulse technique, nor does it have the electrical connections required to use the pre-sync information from the camera's TTL hot shoe pins.


The HSS/Auto FP time line would look like this:

  1. The camera is triggered by the photographer. Several milliseconds of Lag Time pass.
  2. Just before the first shutter would open, communications happen up through the camera's hot shoe. This tells the Speedlight when to begin generating pulsed light as ...
  3. The first shutter opens, exposing the digital sensor while the flash continuously pulses throughout the exposure.
  4. Shortly after the first shutter moves, the second shutter begins to move. The pulsed light continues.
  5. The second shutter in the camera closes and both shutters reset. The flash stops pulsing.


The pulsed light technique cannot emit as much light as a normal flash pulse as it uses a lot of energy to make the light continuous. This means that your flash must be much closer to the subject to be effective.

HyperSync

A normal, non HSS-Auto FP flash duration is much more efficient at delivering light to a subject than an HSS/Auto-FP or pulsed flash method. You can have your flash farther from a subject, or deliver more light to the scene when using a normal flash, as well as use flashes that aren't even capable of pulsing light as required for HSS/Auto-FP.

HyperSync uses special information available in the TTL shoe pins to trigger a normal flash before X-Sync would occur. It does this by knowing how much time passes from these communications until X-sync. It can also eliminate the delay introduced by a radio slave. This is different from the "HSS hack" in that the timing is both adjustable, and can be optimized for some flashes.


HyperSync - The flash fires before the camera sends the "sync" signal


HyperSync - The flash fires before the camera sends the "sync" signal


HyperSync requires a ControlTL transmitter like the Nikon MiniTT1 and FlexTT5 or Canon MiniTT1 and FlexTT5. Optimizing HyperSync Automation results require a ControlTL receiver like the PowerMC2, PowerST4, or AC9 AlienBees Adapter. All transmitter HyperSync adjustments are made in the PocketWizard Utility on the HyperSync/HSS Tab. Any PocketWizard radio can be used as a receiver and be triggered from the ControlTL transmitter's HyperSync timing, but you will see the best results using a ControlTL receiver.


There are two methods of using HyperSync Automation to get flash sync at faster than X-Sync shutter speeds, Highest Energy and Reduced Clipping. Most flashes generate a tall peak of light when first triggered, then that light fades down to a long tail. The two methods choose when to start the flash in relation to the camera's shutters opening.


Reduced Clipping

Reduced Clipping uses precision timing to keep hard black bars out of your images. This method may result in a gradation across the image (lighter at the bottom and darker at the top), but for many situations, the results are quite acceptable and usable.


Reduced Clipping benefits photographers:

  • Shooting outdoors where the sky is a major factor in the top part of the image
  • Using aperture priority in conditions that cause the shutter speed to go above X-sync
  • In any situation where the full frame must be used and cropping is not an option


"Reduced Clipping" is selected on the ControlTL receiver, as shown in the section Configuring HyperSync.



Note: We do not recommend using Speedlites for HyperSync due to both their short flash durations, and their IGBT design, which makes HyperSync feasible only at full power. HSS/Auto-FP may return more desirable results for users shooting above x-sync with Speedlites.


Read the HyperSync section for more detailed information on how to adjust HyperSync.

Highest Energy

Highest Energy uses precision timing to get as much flash energy into the image as possible above X-sync. This will reduce gradation, but can result in black bars or clipping in the frame. For many photographic situations this can yield acceptable or useful results as clipping can be cropped out of the image.



Highest Energy benefits photographers:

  • Needing as much action stopping flash power in the image as possible (remember that for HyperSync, longer flash durations are better)
  • Gathering images where gradation is not acceptable
  • In any situation where cropping is an option


"Highest Energy" is selected on the ControlTL receiver, as shown in the section Configuring HyperSync.



Note: We do not recommend using Speedlites for HyperSync due to both their short flash durations, and their IGBT design, which makes HyperSync feasible only at full power. HSS/Auto-FP may return more desirable results for users shooting above x-sync with Speedlites.


Read the HyperSync section for more detailed information on how to adjust HyperSync.

Factors to consider

There are many factors that change from flash to flash that affect the success of HyperSync.

Flash Duration

  • Flash duration is a critical factor. Longer flash durations are better.

Power Level

  • Flash duration often changes with power level. When you are fine-tuning HyperSync, make sure to test across the flash power levels you intend to use so you can see if certain flash durations will cause clipping at any shutter speed you intend to use. For a great comparison of how important flash duration is, see the 5D Mark II results below for HyperSync with a Ranger RX Pack with an S head, and the results with a Ranger RX Pack with an A head. It's the same pack, same camera, but the flash duration is much, much shorter with the A head, and has a very noticeable visual effect. You can see these images and more on our Camera HyperSync results page.


Shutter Blade Travel Rate

  • The shutter blade travel rate is the time it takes the curtains to physically move from the top of the sensor to the bottom of the sensor. This is not your camera's shutter speed setting. Cameras with larger and slower shutter blades will make HyperSync less likely to work without noticeable gradation. Faster shutter blades, smaller sensors, or crop mode can often improve HyperSync success by minimizing gradation.


Camera Communication Time

  • Some cameras send signals up through their hot shoe before x-sync sooner than others. This gives the radios themselves a larger window of opportunity for adjustment, resulting in no "clipping" at the bottom of the frame, and some do not, resulting in "clipping" at the bottom of the frame.


What results can I get with my camera and flash?

Thankfully, we've done a lot of the guess work for you, the customer, by shooting as many cameras as we can with as many ControlTL compatible flashes as we can. You can see those below. Simply click on your camera, then find the flash that you wish to use with HyperSync. There are countless combinations of flashes and cameras in the world, and only so many hours in a day, so we are constantly trying to add more and more flashes as time goes by. If you don't see a flash yet, feel free to contact us directly: www.pocketwizard.com/contact/inquiry/

Canon Camera HyperSync Results
Canon 1D X Canon 7D Canon 70D Canon Rebel T5i (700D)
Canon 1D Mark IV Canon 6D Canon 60D Canon Rebel T5 (1200D)
Canon 1Ds Mark III Canon 5D Mark III Canon 50D Canon Rebel SL1 (650D)
Canon 1D Mark III Canon 5D Mark II Canon 40D Canon Rebel T4i (650D)
Canon 1Ds Mark II Canon 5D Canon 30D Canon Rebel T3i (600D)
Canon 1D Mark II N Canon 20D Canon Rebel T3 (110D)
Canon 1D Mark II Canon Rebel T2i (550D)
Canon Rebel T1i (500D)
Canon Rebel XSi (450D)
Canon Rebel XTi (400D)
Canon Rebel XT (350D)
Canon Rebel XS (1000D)
Nikon Camera HyperSync Results
Nikon D4S Nikon D810 Nikon D7100 Nikon Df
Nikon D4 Nikon D800 Nikon D7000
Nikon D3x Nikon D800E Nikon D5300* Nikon D90
Nikon D3s Nikon D700 Nikon D5200* Nikon D80
Nikon D3 Nikon D610 Nikon D5100* Nikon D40x*
Nikon D2x Nikon D600 Nikon D5000* Nikon D40*
Nikon D300s Nikon D3300*
Nikon D300 Nikon D3200*
Nikon D200 Nikon D3100*
Nikon D3000*

* These cameras do not support HyperSync or HSS/FP-Sync operation: D5300, D5200, D5100, D5000, D3300, D3200, D3100, D3000, D40x, D40

Don't see your gear?
We have paused our HyperSync testing and PDF production for the time being. We may be adding more results to the wiki as they become available. Check back in the future.