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<blockquote data-quote="WayneF" data-source="post: 480728" data-attributes="member: 12496">There are ways of looking at it though.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />It is a valid and useful point that there is no need for Slow Sync in M&nbsp; or S mode, since you can already set any shutter speed you want there.&nbsp;&nbsp; Slow sync would be pointless and unusable... camera has to use the shutter speed you set (in M or S mode).A and P modes honor the E2 menu, which is a Minimum shutter speed for&nbsp; flash.&nbsp; Default E2 menu is 1/60 second, so A or P modes with flash&nbsp; indoors will likely always be 1/60 second&nbsp; (because we're using&nbsp; flash, typically we don't want it any slower).&nbsp; &nbsp;&nbsp; If we want it faster, we have to use M mode, or go out into brighter light that will meter higher.&nbsp; If we want it slower, we have to use M mode or if automation is desired, use Slow Sync... Or we can set the E2 menu to a slower limit.All that Slow sync does is to ignore and bypass that E2 minimum shutter&nbsp; speed for A or P modes with flash.&nbsp; Saying, all that Slow sync does is&nbsp; to just be allowed to use whatever slow shutter speed that the ambient&nbsp; meters, for the purpose of properly exposing the ambient metering.&nbsp; Rear Curtain sync in A or P mode includes Slow Sync (on Nikons), because Rear Curtain positions the ambient blur trailing the moving subject. Without ambient blur, no point of Rear Curtain.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />No Slow or Rear Curtain sync in Auto mode, the camera assumes full control of everything.</blockquote>

[QUOTE="WayneF, post: 480728, member: 12496"] There are ways of looking at it though. :) It is a valid and useful point that there is no need for Slow Sync in M or S mode, since you can already set any shutter speed you want there. Slow sync would be pointless and unusable... camera has to use the shutter speed you set (in M or S mode). A and P modes honor the E2 menu, which is a Minimum shutter speed for flash. Default E2 menu is 1/60 second, so A or P modes with flash indoors will likely always be 1/60 second (because we're using flash, typically we don't want it any slower). If we want it faster, we have to use M mode, or go out into brighter light that will meter higher. If we want it slower, we have to use M mode or if automation is desired, use Slow Sync... Or we can set the E2 menu to a slower limit. All that Slow sync does is to ignore and bypass that E2 minimum shutter speed for A or P modes with flash. Saying, all that Slow sync does is to just be allowed to use whatever slow shutter speed that the ambient meters, for the purpose of properly exposing the ambient metering. Rear Curtain sync in A or P mode includes Slow Sync (on Nikons), because Rear Curtain positions the ambient blur trailing the moving subject. Without ambient blur, no point of Rear Curtain. :) No Slow or Rear Curtain sync in Auto mode, the camera assumes full control of everything. [/QUOTE]

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