D750 using the on camera flash..

[karlreed]

I just noticed that, using the on camera flash in auto iso, the camera meters as if the flash setting is "slow", and, pushed the iso for a dark image. BUT holds shutter to 1/60 (as I've set it) and whatever the f no. is.

With an external flash, ISO goes to 400 when in Auto ISO.

Both of thse things seem a bit odd.

Have I missed something in the manual?

 

[romfordbluenose]

I haven't got a D750 and I also never use auto ISO with flash and control the exposure using the flash itself.

Perhaps though the camera recognises the different power output of the flash in some way and adjusts ISO accordingly. It may also adjust the ISO if the distance to subject changes. I must admit though I don't know the answer and have replied to this so I can track the "expert" answer when it comes in.

 

[Richard D Jacobs]

I've read in a number of places that Auto-iso is not recommended with flash.

Richard

 

[halcon]

I've read in a number of places that Auto-iso is not recommended with flash.

Richard

Yes. I don't shoot flash that much, but I find I have better success shooting flash in all Manual mode. Something like 120 speed, aperture as desired, then adjust ISO to your taste (desired exposure).

 

[karlreed]

Just spoke to Nikon Australia who confirm that the auto iso will function when the on-camera flash is activated. If you want a fixed iso, then, you turn off the auto iso.

However, with an SB800 mounted, and auto iso, the iso went to 400, not a bad choice.

 

[James809]

I just noticed that, using the on camera flash in auto iso, the camera meters as if the flash setting is "slow", and, pushed the iso for a dark image. BUT holds shutter to 1/60 (as I've set it) and whatever the f no. is.

With an external flash, ISO goes to 400 when in Auto ISO.

Both of thse things seem a bit odd.

Have I missed something in the manual?

 

[tony field]

When using flash with auto-iso, the camera meters the ambient light and adjusts the aperture and/or the shutter and the ISO for the ambient light. if the ambient light is very low, the auto-iso becomes very high.

When the shot is taken, the flash works in "fill light" mode. This works well, however you might not like the ISO selected for the ambient light.

Therefore, you might prefer to set the camera to "not auto-ISO" and shoot in manual mode choosing a useful ISO, shutterspeed and lens aperture.

 

[karlreed]

When using flash with auto-iso, the camera meters the ambient light and adjusts the aperture and/or the shutter and the ISO for the ambient light. if the ambient light is very low, the auto-iso becomes very high.

When the shot is taken, the flash works in "fill light" mode. This works well, however you might not like the ISO selected for the ambient light.

Therefore, you might prefer to set the camera to "not auto-ISO" and shoot in manual mode choosing a useful ISO, shutterspeed and lens aperture.

 

[BirgerH]

I just noticed that, using the on camera flash in auto iso, the camera meters as if the flash setting is "slow", and, pushed the iso for a dark image. BUT holds shutter to 1/60 (as I've set it) and whatever the f no. is.

With an external flash, ISO goes to 400 when in Auto ISO.

Both of thse things seem a bit odd.

Have I missed something in the manual?

 

[DYOC]

astonishing ...

nothings seems to have changed from the film N80 or Kodak DCS 14n days.

ISO 80 - 160 1/60th f3.3

ISO 200 - 400 1/60th f4.0

_________________________________________________

I was hoping that one could make the D750 default @5.6 1/60th

using ISO800

is this at all possible yes/no/maybe ?

 

[BirgerH]

When using flash with auto-iso, the camera meters the ambient light and adjusts the aperture and/or the shutter and the ISO for the ambient light. if the ambient light is very low, the auto-iso becomes very high.

When the shot is taken, the flash works in "fill light" mode. This works well, however you might not like the ISO selected for the ambient light.

Therefore, you might prefer to set the camera to "not auto-ISO" and shoot in manual mode choosing a useful ISO, shutterspeed and lens aperture.