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Auto ISO with a Hot-Shoe Mounted Flash

jammike

US
4 posts

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jammike Registered since 19th Jun 2012
Tue 19-Jun-12 01:36 PM

The behaviour of the Auto ISO algorithm is consistent when using the camera pop-up flash in slow mode as well. Unfortunately, things are weirder when using a hot-shoe mounted flash, such as an SB-400. In this case, the camera increases the ISO sensitivity up to four times the value currently selected and won't raise it any more, even if you selected a greater maximum ISO.

As per the blog
http://thegreyblog.blogspot.com/2011/08/weird-auto-iso-behaviour-on-nikon-d5100.html

The 1.01 firmware seems to fix this undocumented "feature": the Auto ISO behaviour is the same when using either the pop-up flash or a hot-shoe mounted flash.

However My 5100 (bought recently) has firmware 1.01 but it is still exhibiting the same problem. Has anyone else also faced this issue ?

Leonard62

Pa, US
4419 posts

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#1. "RE: Auto ISO with a Hot-Shoe Mounted Flash" | In response to Reply # 0

Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Writer Ribbon awarded for his contributions to the Nikonians Resources articles library Nikonian since 15th Mar 2009
Tue 19-Jun-12 12:07 PM

The bottom line is don't use Auto ISO with flash of any kind with the D5100 or D3200 for that matter.

The camera Auto ISO will raise the ISO value to match the darkened ambient light in the room. In the case of setting the high ISO point to 3200 or 6400 with the built in flash it could raise the ISO up to that point.

I just set my D5100 to Auto ISO with a high point of ISO 3200. I then took two identical photos.
With the built in flash ISO jumped to 3200. I had the default ISO set at 200.
With the SB400 flash mounted, Auto ISO set the ISO to 800. So the bloggers 4X number seems correct with the SB400.

Again. Don't use Auto ISO with flash.

Len

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Leonard62

Pa, US
4419 posts

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#2. "RE: Auto ISO with a Hot-Shoe Mounted Flash" | In response to Reply # 1

Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Writer Ribbon awarded for his contributions to the Nikonians Resources articles library Nikonian since 15th Mar 2009
Tue 19-Jun-12 12:09 PM

By the way, this is not a problem with your camera. It seems to be a feature designed in by Nikon.

This has been discussed many times on this forum.

Len


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jammike

US
4 posts

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#3. "RE: Auto ISO with a Hot-Shoe Mounted Flash" | In response to Reply # 2

jammike Registered since 19th Jun 2012
Tue 19-Jun-12 12:29 PM

thanks Leonard62,
I got the impression from the Blog that this was a bug not a feature. Infact this is what prompted me to fix the Auto ISO Sensitivity settings. thanks for your input.

G