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<blockquote data-quote="Revet" data-source="post: 415879" data-attributes="member: 17612">Thanks again,&nbsp; all makes sense.&nbsp; So now I see the beauty of the D7100.&nbsp; With those U1 settings set for indoor flash using TTL and camera mode M, if I put the E4 option to the &quot;Canon Mode&quot; in which EC affects both background (ambient) and flash; essentially I have an expanded flash power control.&nbsp; If I use FC, I am adjusting flash power between -3 and +1.&nbsp; But if I use EC instead, I am adjusting flash power between -5 and +5 since EC only affects flash power and not ambient if you are in M mode.&nbsp; That of course is the case only if you don't max out your camera power but it is nice to be able to go past +1 if you have it available.&nbsp; I could go to the flash to adjust power but I think your right, it is best to do one thing consistently.&nbsp; I ran some tests and this is what happens, if I set the E4 option to Background and flash, the EC becomes a wider range (+5 to -5 ev) control of flash power.&nbsp; Very cool!!Now when I am outdoors and I want fill flash.&nbsp; I change to P mode, use TTL-BL (matrix or cnt wt).&nbsp; Now in this mode I think I will use the E4 option for Nikon (ie. ambient only).&nbsp; That way I can control flash with FC and ambient (background) with EC.&nbsp; Now, you did mention something which doesn't quite make sense to me.&nbsp; Lets say I have the E4 option set on Nikon mode (EC affects only background or ambient and not flash power).&nbsp; If I am not in M mode, what is the camera changing to only affect ambient light if it doesn't change shutter speed???&nbsp;&nbsp; Any change in aperture or ISO will affect both flash and ambient.&nbsp; Is this one of those magic wand tricks that Nikon uses that we just don't know what it is doing??&nbsp; I ran some tests and here is what I found.&nbsp; If I have option E4 set such that EC affects background only (I am still in TTL mode during this test).&nbsp; When I have it in M mode, EC does nothing as above; in A mode, EC changes shutter speed: in S mode, EC changes aperture, and in P mode, EC doesn't change aperture, shutter speed or ISO and magically some how the background is a little different!!!&nbsp;&nbsp; Weird!!!&nbsp; &nbsp; So anyhow, how can we be changing background only in S mode where aperture is changing.&nbsp; Doesn't that change both flash and ambient????&nbsp;&nbsp; If have no idea what is going on in P mode which shows no change in Aperture, shutter speed or ISO but the background is different between EC +3, 0 and -3 ev.</blockquote>

[QUOTE="Revet, post: 415879, member: 17612"] Thanks again, all makes sense. So now I see the beauty of the D7100. With those U1 settings set for indoor flash using TTL and camera mode M, if I put the E4 option to the "Canon Mode" in which EC affects both background (ambient) and flash; essentially I have an expanded flash power control. If I use FC, I am adjusting flash power between -3 and +1. But if I use EC instead, I am adjusting flash power between -5 and +5 since EC only affects flash power and not ambient if you are in M mode. That of course is the case only if you don't max out your camera power but it is nice to be able to go past +1 if you have it available. I could go to the flash to adjust power but I think your right, it is best to do one thing consistently. I ran some tests and this is what happens, if I set the E4 option to Background and flash, the EC becomes a wider range (+5 to -5 ev) control of flash power. Very cool!! Now when I am outdoors and I want fill flash. I change to P mode, use TTL-BL (matrix or cnt wt). Now in this mode I think I will use the E4 option for Nikon (ie. ambient only). That way I can control flash with FC and ambient (background) with EC. Now, you did mention something which doesn't quite make sense to me. Lets say I have the E4 option set on Nikon mode (EC affects only background or ambient and not flash power). If I am not in M mode, what is the camera changing to only affect ambient light if it doesn't change shutter speed??? Any change in aperture or ISO will affect both flash and ambient. Is this one of those magic wand tricks that Nikon uses that we just don't know what it is doing?? I ran some tests and here is what I found. If I have option E4 set such that EC affects background only (I am still in TTL mode during this test). When I have it in M mode, EC does nothing as above; in A mode, EC changes shutter speed: in S mode, EC changes aperture, and in P mode, EC doesn't change aperture, shutter speed or ISO and magically some how the background is a little different!!! Weird!!! So anyhow, how can we be changing background only in S mode where aperture is changing. Doesn't that change both flash and ambient???? If have no idea what is going on in P mode which shows no change in Aperture, shutter speed or ISO but the background is different between EC +3, 0 and -3 ev. [/QUOTE]

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