Reading mode: Light Dark

D750 built-in flash question

Go to last post
Hans vdC

Hans vdC

Veteran Member
Messages
3,495
Solutions
1
Reaction score
1,025
Location
Oudenaarde
I have noticed that when I use the built-in flash on my Nikon D750, the camera seems to keep the same ISO (when set to auto ISO) like when not using the flash. On my other cameras (Sony a6000 and Canon SLR's before), when flash is used, the camera usually pushes down the ISO because it 'knows' there will me more light from the flash.

Is this a setting I miss? It's a bit annoying to have to set the auto ISO to off when using flash like it is now.
 
I just did a test sitting in my living room...

Aperture priority, auto ISO, no flash: 1/250, f/4, iso3200

Aperture priority, auto ISO, flash: 1/250, f/4, iso2000
 
I'm curious, What is the ISO number?
 
I just tried this on my camera and the ISO changed. With the flash off it was at iso4000. When I popped up the flash, the iso changed to iso2200. Are you sure you are not hitting some other limit. Like the camera wanting to increase shutter speed before it would reduce iso.
 
What's your flash sync speed set to? For some reason, I had mine set to 1/250, but it really should be slower. Also, when setting Auto ISO, what is your minimum shutter speed set to? I have mine set to one notch faster than midpoint, which causes my setup to stay up high on purpose.
 
Hans von der Crone said:
I have noticed that when I use the built-in flash on my Nikon D750, the camera seems to keep the same ISO (when set to auto ISO) like when not using the flash. On my other cameras (Sony a6000 and Canon SLR's before), when flash is used, the camera usually pushes down the ISO because it 'knows' there will me more light from the flash.

Is this a setting I miss? It's a bit annoying to have to set the auto ISO to off when using flash like it is now.
Click to expand...
Not a D750 owner

I'm a flash newb but you have to shut auto iso off or it goes to the max. Auto ISO Sensitivity Control that you set-up in the menu.

--
http://www.flickr.com/photos/lickitysplit11111/
 
Last edited:
With auto-iso on, camera will frequently raise iso to balance flash and ambient lighting. If you want more control over flash exposure settings, turn off auto-iso and set iso manually.
 
Hans von der Crone said:
I have noticed that when I use the built-in flash on my Nikon D750, the camera seems to keep the same ISO (when set to auto ISO) like when not using the flash. On my other cameras (Sony a6000 and Canon SLR's before), when flash is used, the camera usually pushes down the ISO because it 'knows' there will me more light from the flash.

Is this a setting I miss? It's a bit annoying to have to set the auto ISO to off when using flash like it is now.
Click to expand...
Hi,

Nikon has changed the way auto iso works with flash starting from D300S. Now it works differently with built-in and external flash. With built-in it raises iso to balance flash and ambient. With external it raises iso one step above the one you set manually and raises it when distance exeeds GN number.
 
Hans von der Crone said:
I have noticed that when I use the built-in flash on my Nikon D750, the camera seems to keep the same ISO (when set to auto ISO) like when not using the flash. On my other cameras (Sony a6000 and Canon SLR's before), when flash is used, the camera usually pushes down the ISO because it 'knows' there will me more light from the flash.

Is this a setting I miss? It's a bit annoying to have to set the auto ISO to off when using flash like it is now.
Click to expand...
Why you wanna use Auto iso with flash?

Just save different U profile with flash use. Manual mode with ISO manual with TTL. Then you can balance the ambient and flashgiht, also you can control the shutterspeed and aperture for DOF and TTL with selected exposure mode takes care of exposure.
 
Hans von der Crone said:
I have noticed that when I use the built-in flash on my Nikon D750, the camera seems to keep the same ISO (when set to auto ISO) like when not using the flash. On my other cameras (Sony a6000 and Canon SLR's before), when flash is used, the camera usually pushes down the ISO because it 'knows' there will me more light from the flash.

Is this a setting I miss? It's a bit annoying to have to set the auto ISO to off when using flash like it is now.
Click to expand...
I think the behavior is documented on p138 of the manual. I suspect it's using whatever is set in "Flash shutter speed", custom E2 setting, which I think defaults to 1/60s. Then auto ISO kicks in and adjusts the ISO to that shutter speed. From my understanding and experience, using the flash with auto iso usually results in effectively fill flash as long as you've specified a sufficiently high upper limit for the auto ISO. You will have to set to manual ISO or limit the maximum ISO to have flash be the primary light contributor to the shot. IMHO, this is how it's supposed to work this since I set my auto ISO to a maximum value of tolerable noise for my preference. If I turn on the flash, it is to just fill a bit or when maximum ISO isn't enough to give me good exposure. The logic in the camera is basically reduces the "cave" effect within the iso limits you've specified.
 
j_photo said:
chuxter said:
Sagittarius said:
chuxter said:
Sagittarius said:
...GN number.
Click to expand...
Redundant, it is.
Click to expand...
OK, just GN.
Click to expand...
Sorry; could not keep from posting. ;-)
Click to expand...
Even if redundant, the information provided was informed and useful. I'll take that around here any day.
Click to expand...
Wow, that was helpful. I was thinking it was just unpredictable with the external flash. Forgot that Hogan treated that in his D600 manual. Since there is no Hogan D750 manual, my AARP card says I'm allowed to forget without penalty. Hhmmm, the noise in my images says they don't agree.:)
 
j_photo said:
With auto-iso on, camera will frequently raise iso to balance flash and ambient lighting. If you want more control over flash exposure settings, turn off auto-iso and set iso manually.
Click to expand...
I didn't know that..
 
You must log in or register to reply here.

Keyboard shortcuts

f
Forum
m
My threads
Mobile site
About
Editorial content
Cameras & Lenses
Community
All content, design, and layout are Copyright © 1998–2025 Digital Photography Review All Rights Reserved.
Reproduction in whole or part in any form or medium without specific written permission is prohibited.
When you use DPReview links to buy products, the site may earn a commission.
©GPS Media - Guides, Products, Services.
Back
Top