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<blockquote data-quote="pedroj" data-source="post: 300630" data-attributes="member: 9297">This might help...[h=3]<a href="http://www.scantips.com/lights/" target="_blank">Menu of the other photo pages here</a>[/h]&nbsp; &nbsp;&nbsp; [h=1]Nikon Auto FP flash mode (HSS) - What is it?[/h]&nbsp; This topic is more special purpose, so no harm is done by skipping this page for now. <a href="http://www.scantips.com/lights/flashbasics3.html" target="_blank"> Next Page - Soft Light</a>.&nbsp; &nbsp;This article is too long unless you really want to know. Here is a very short version: Auto FP (also called HSS flash) is an entirely different flash&nbsp; mode, where the flash is triggered repeatedly and rapidly (tens of&nbsp; thousands of times per second), so that it mimics being &quot;on&quot; like&nbsp; continuous light (like sunlight or a desk lamp is on continuously).&nbsp; Humans still see a &quot;flash&quot;, but this continuous duration is on during&nbsp; the longer focal plane shutter travel time (which eliminates any shutter&nbsp; sync problem). To be able to be on continuously, it can only run at&nbsp; about 20% power level. The purpose of it being continuous is that there is no concept of&nbsp; sync, any shutter speed works (the only reason it is called High Speed&nbsp; Sync). Like sunlight, it works at any high shutter speed, but HSS is NOT&nbsp; high speed flash. It is no longer a speedlight - continuous light has&nbsp; no motion stopping capability (we do still have the shutter speed, but&nbsp; the speedlight was typically much faster). Since it is continuous, Equivalent Exposures apply again now, meaning a&nbsp; wide aperture can compensate for the light losses of a fast shutter&nbsp; speed, for both FP flash or for ambient, since both are continuous. Did I mention that FP acts as another continuous light? It no longer acts like &quot;flash&quot; and certainly is no longer a speedlight. The usual purpose of this FP flash mode is to provide wide&nbsp; aperture, by allowing fast shutter speeds with fill flash in bright sun,&nbsp; at perhaps 1/3200 second at f/2.8 (ISO 100) - if desired, and if the&nbsp; reduced power allows sufficient distance range. The flash has to be built to implement this continous mode. The&nbsp; camera has to be built to enable and trigger it. The camera and flash&nbsp; have to communicate about this, parts of a matched system, not just any&nbsp; random parts.</blockquote>

[QUOTE="pedroj, post: 300630, member: 9297"] This might help... [h=3][URL="http://www.scantips.com/lights/"]Menu of the other photo pages here[/URL][/h] [h=1]Nikon Auto FP flash mode (HSS) - What is it?[/h] This topic is more special purpose, so no harm is done by skipping this page for now. [URL="http://www.scantips.com/lights/flashbasics3.html"] Next Page - Soft Light[/URL]. This article is too long unless you really want to know. Here is a very short version: Auto FP (also called HSS flash) is an entirely different flash mode, where the flash is triggered repeatedly and rapidly (tens of thousands of times per second), so that it mimics being "on" like continuous light (like sunlight or a desk lamp is on continuously). Humans still see a "flash", but this continuous duration is on during the longer focal plane shutter travel time (which eliminates any shutter sync problem). To be able to be on continuously, it can only run at about 20% power level. The purpose of it being continuous is that there is no concept of sync, any shutter speed works (the only reason it is called High Speed Sync). Like sunlight, it works at any high shutter speed, but HSS is NOT high speed flash. It is no longer a speedlight - continuous light has no motion stopping capability (we do still have the shutter speed, but the speedlight was typically much faster). Since it is continuous, Equivalent Exposures apply again now, meaning a wide aperture can compensate for the light losses of a fast shutter speed, for both FP flash or for ambient, since both are continuous. Did I mention that FP acts as another continuous light? It no longer acts like "flash" and certainly is no longer a speedlight. The usual purpose of this FP flash mode is to provide wide aperture, by allowing fast shutter speeds with fill flash in bright sun, at perhaps 1/3200 second at f/2.8 (ISO 100) - if desired, and if the reduced power allows sufficient distance range. The flash has to be built to implement this continous mode. The camera has to be built to enable and trigger it. The camera and flash have to communicate about this, parts of a matched system, not just any random parts. [/QUOTE]

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