https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&feed=atom&action=history
IGBT-controlled flashes vs. Voltage-controlled flashes - Revision history
2024-03-29T14:59:30Z
Revision history for this page on the wiki
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https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2765&oldid=prev
Chris: /* Variable Voltage Control */
2014-01-30T21:28:29Z
<p><span dir="auto"><span class="autocomment">Variable Voltage Control</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 21:28, 30 January 2014</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[File:Ranger RX <del class="diffchange diffchange-inline">7</del>.5 Power Flash Duration.JPG|400px|center|framless|Ranger RX pack with the S head at lowest power]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[File:Ranger RX <ins class="diffchange diffchange-inline">S-Head 1</ins>.5 Power Flash Duration.JPG|400px|center|framless|Ranger RX pack with the S head at lowest power]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><center>Typical Flash Duration Simulation - Ranger RX pack with the S head at lowest power</center></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><center>Typical Flash Duration Simulation - Ranger RX pack with the S head at lowest power</center></div></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2681&oldid=prev
Chris: /* IGBT Power Control */
2013-08-29T19:03:16Z
<p><span dir="auto"><span class="autocomment">IGBT Power Control</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 19:03, 29 August 2013</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>At full power, the IGBT is not engaged, and the flash fully discharges its capacitors.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>At full power, the IGBT is not engaged, and the flash fully discharges its capacitors<ins class="diffchange diffchange-inline">. Notice how this graph looks similar to the ones above</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[File:580ex_II_full.JPG|400px|center|frameless|580EX II at 1/1 power]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[File:580ex_II_full.JPG|400px|center|frameless|580EX II at 1/1 power]]</div></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2680&oldid=prev
Chris: /* IGBT Power Control */
2013-08-29T18:59:51Z
<p><span dir="auto"><span class="autocomment">IGBT Power Control</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 18:59, 29 August 2013</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==IGBT Power Control==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==IGBT Power Control==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Some studio strobes (and all speedlights) use a device called an IGBT to control their power output. IGBT stands for “Isolated-gate bipolar transistor.” This is a high speed switch that is designed to turn power on and off rapidly.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Some studio strobes (and <ins class="diffchange diffchange-inline">almost </ins>all speedlights) use a device called an IGBT to control their power output. IGBT stands for “Isolated-gate bipolar transistor.” This is a high speed switch that is designed to turn power on and off rapidly.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2678&oldid=prev
Chris: /* Effects on HyperSync */
2013-08-29T14:24:50Z
<p><span dir="auto"><span class="autocomment">Effects on HyperSync</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 14:24, 29 August 2013</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:FP_Sync_Optical.jpg|580EX II at 1/2 power with High Speed Sync.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:FP_Sync_Optical.jpg|580EX II at 1/2 power with High Speed Sync.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>File:<del class="diffchange diffchange-inline">580EX_II_full_timing</del>.JPG|580EX II at 1/2 power with HyperSync. 5D Mark II 1/8000th f/11 ISO 1000</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>File:<ins class="diffchange diffchange-inline">580EX_II_half_timing</ins>.JPG|580EX II at 1/2 power with HyperSync. 5D Mark II 1/8000th f/11 ISO 1000</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div></gallery></center></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div></gallery></center></div></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2672&oldid=prev
Chris: /* Effects on HyperSync */
2013-08-22T22:15:05Z
<p><span dir="auto"><span class="autocomment">Effects on HyperSync</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:15, 22 August 2013</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Because of the effect the IGBT has on HyperSync results, we recommend that Speedlight users who need to adjust power above X-sync to use [[High Speed Sync|High Speed Sync or FP-Mode instead.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Because of the effect the IGBT has on HyperSync results, we recommend that Speedlight users who need to adjust power above X-sync to use [[High Speed Sync|High Speed Sync or FP-Mode instead.]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><center><gallery perrow=2 widths=300px caption="HyperSync vs High Speed Sync at +2"></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><center><gallery perrow=2 widths=300px caption="HyperSync vs High Speed Sync at +2 <ins class="diffchange diffchange-inline">power</ins>"></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000_580_EX_II_+3_HSS.jpg</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000_580_EX_II_+3_HSS.jpg</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>File:FP_Sync_Optical.jpg|580EX II at 1/<del class="diffchange diffchange-inline">1 </del>power with High Speed Sync.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>File:FP_Sync_Optical.jpg|580EX II at 1/<ins class="diffchange diffchange-inline">2 </ins>power with High Speed Sync.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>File:580EX_II_full_timing.JPG|580EX II at <del class="diffchange diffchange-inline">½ </del>power with HyperSync. 5D Mark II 1/8000th f/11 ISO 1000</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>File:580EX_II_full_timing.JPG|580EX II at <ins class="diffchange diffchange-inline">1/2 </ins>power with HyperSync. 5D Mark II 1/8000th f/11 ISO 1000</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div></gallery></center></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div></gallery></center></div></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2671&oldid=prev
Chris: /* Effects on HyperSync */
2013-08-22T22:14:38Z
<p><span dir="auto"><span class="autocomment">Effects on HyperSync</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:14, 22 August 2013</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Because of the effect the IGBT has on HyperSync results, we recommend that Speedlight users who need to adjust power above X-sync to use [[High Speed Sync|High Speed Sync or FP-Mode instead.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Because of the effect the IGBT has on HyperSync results, we recommend that Speedlight users who need to adjust power above X-sync to use [[High Speed Sync|High Speed Sync or FP-Mode instead.]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><center><gallery perrow=2 widths=300px caption="HyperSync vs High Speed Sync<del class="diffchange diffchange-inline">: Difference between +3 and </del>+2"></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><center><gallery perrow=2 widths=300px caption="HyperSync vs High Speed Sync <ins class="diffchange diffchange-inline">at </ins>+2"></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000_580_EX_II_+3_HSS.jpg</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000_580_EX_II_+3_HSS.jpg</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>File:8000._580_EX_II_+2_HyperSync.jpg</div></td></tr>
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Chris
https://wiki.pocketwizard.com/index.php?title=IGBT-controlled_flashes_vs._Voltage-controlled_flashes&diff=2670&oldid=prev
Chris: Created page with "{{recommended reading|Understanding HyperSync and High Speed Sync|}} __TOC__ <br /> ==Variable Voltage Control== Many studio strobes use variable voltage to control the out..."
2013-08-22T22:13:47Z
<p>Created page with "{{recommended reading|Understanding HyperSync and High Speed Sync|}} __TOC__ <br /> ==Variable Voltage Control== Many studio strobes use variable voltage to control the out..."</p>
<p><b>New page</b></p><div>{{recommended reading|Understanding HyperSync and High Speed Sync|}}<br />
<br />
__TOC__<br />
<br /><br />
<br />
==Variable Voltage Control==<br />
<br />
Many studio strobes use variable voltage to control the output of the flashtube. This means that the amount of energy emitted from the flashtube is varied to generate different power levels. Full power emits a flash curve with a tall “peak” of flash energy output, and a diminishing “tail.”<br />
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[[File:Ranger RX 7.5 Power Flash Duration.JPG|400px|center|frameless|Ranger RX pack with the S head at full power]]<br />
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<center>Typical flash duration simulation - Ranger RX pack with the S head at full power</center><br />
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Lower power levels still have a tall peak energy output, and a diminishing tail, but the tail may diminish over a longer or shorter period of time, and the peak may not be so abrupt (instantaneous) as compared to a higher power level.<br />
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[[File:Ranger RX 7.5 Power Flash Duration.JPG|400px|center|framless|Ranger RX pack with the S head at lowest power]]<br />
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<center>Typical Flash Duration Simulation - Ranger RX pack with the S head at lowest power</center><br />
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When HyperSync is used with a voltage controlled flash, any power level can be used. Best results will happen at the longest duration, and we generally recommend full power for best results. You can see what effect voltage controlled flash power can have on HyperSync [[Understanding HyperSync and High Speed Sync#Power Level|by seeing our Power Level section of our Understanding HyperSync and High Speed Sync page.]]<br />
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==IGBT Power Control==<br />
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Some studio strobes (and all speedlights) use a device called an IGBT to control their power output. IGBT stands for “Isolated-gate bipolar transistor.” This is a high speed switch that is designed to turn power on and off rapidly. <br />
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At full power, the IGBT is not engaged, and the flash fully discharges its capacitors.<br />
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[[File:580ex_II_full.JPG|400px|center|frameless|580EX II at 1/1 power]]<br />
<center>580EX II at 1/1 power</center><br />
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At power levels lower than full power, the IGBT shuts off the flashtube before the capacitors in the flash have emitted all their power. The voltage sent to the flash tube before the IGBT engages is the same as at full power until the IGBT is engaged. When shown in graph form, an IGBT-controlled pulse looks like a full power pulse with the tail portion cut off. <br />
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[[File:580ex_ii_half.JPG|400px|center|frameless|580EX II at 1/2 power]]<br />
<center>580EX II at 1/2 power</center><br />
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The same thing happens with the Einstein E-640 and other IGBT controlled studio strobes.<br />
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[[File:Einstein_FlashDuration_Full.JPG|400px|center|frameless|Einstein E640 at full power]]<br />
<center>Einstein E640 at full power</center><br />
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[[File:Einstein_-1.JPG|400px|center|frameless|Einstein E640 at -1 from full power]]<br />
<center>Einstein E640 at -1 from full power</center><br />
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<br />
===Effects on HyperSync===<br />
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<br />
This IGBT method of power control allows for very short flash durations. At X-sync, motion blur from flash is reduced with shorter flash durations. However, very short flash durations are not beneficial to HyperSync. Because there is no flash “tail,” the camera cannot expose the entire sensor across some portion of the flash duration. When using HyperSync, only a small band of light will be illuminated in the middle of the frame. This band becomes smaller the lower the power level used on the flash or Speedlight. <br />
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<center><gallery perrow=2 widths=300px caption="IGBT-controlled flash at 1/1 power and 1/2 power"><br />
File:5DMarkIIEinsteinFullPower.JPG|Einstein E640 at full power, 5D Mark II 1/8000th f/11<br />
File:5D_Mark_II_Einstein-1Stops.JPG|Einstein E640 (with PowerMC2) -1 stop from full, 5D Mark II 1/8000th f/11<br />
File:Einstein_full_timing.JPG|Einstein E640 Flash Duration Shape t.5=1/2000th<br />
File:Einstein_FlashDuration_-1.JPG|Einstein E640 Flash Duration Shape t.5=1/4000th (estimated)<br />
</gallery></center><br />
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<br />
Because of the effect the IGBT has on HyperSync results, we recommend that Speedlight users who need to adjust power above X-sync to use [[High Speed Sync|High Speed Sync or FP-Mode instead.]]<br />
<br />
<center><gallery perrow=2 widths=300px caption="HyperSync vs High Speed Sync: Difference between +3 and +2"><br />
File:8000_580_EX_II_+3_HSS.jpg<br />
File:8000._580_EX_II_+2_HyperSync.jpg<br />
File:FP_Sync_Optical.jpg|580EX II at 1/1 power with High Speed Sync.<br />
File:580EX_II_full_timing.JPG|580EX II at ½ power with HyperSync. 5D Mark II 1/8000th f/11 ISO 1000<br />
</gallery></center></div>
Chris