Auto ISO and bracketing

Started 4 months ago | Questions
mek42 Regular Member • Posts: 174
Auto ISO and bracketing

Do the bodies with auto-ISO go above max ISO if needed for bracketing or exposure compensation?

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Nikon D2Hs
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mostlyboringphotog Veteran Member • Posts: 9,538
Re: Auto ISO and bracketing

mek42 wrote:

Do the bodies with auto-ISO go above max ISO if needed for bracketing or exposure compensation?

I could try - I got recently interested in how auto-ISO and EC work - but what do yo mean by max ISO? The limit you set in the menu or the camera's max ISO rating 25600? Or even the expaneded ISO?

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Panasonic Lumix DMC-GM1 Pentax 645Z Nikon 1 J5 Fujifilm GFX 50R Canon EOS RP
OP mek42 Regular Member • Posts: 174
Re: Auto ISO and bracketing

mostlyboringphotog wrote:

mek42 wrote:

Do the bodies with auto-ISO go above max ISO if needed for bracketing or exposure compensation?

I could try - I got recently interested in how auto-ISO and EC work - but what do yo mean by max ISO? The limit you set in the menu or the camera's max ISO rating 25600? Or even the expaneded ISO?

The menu limit.

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Nikon D2Hs
Reggie Stration
Reggie Stration Contributing Member • Posts: 600
Re: Auto ISO and bracketing
1

mek42 wrote:

Do the bodies with auto-ISO go above max ISO if needed for bracketing or exposure compensation?

The camera won’t use ISO in bracketing unless you have turned auto ISO on. And if you have turned it on, then it depends on which mode you are in for how Auto ISO is utilized. The following is from the D850 manual.

mostlyboringphotog Veteran Member • Posts: 9,538
Re: Auto ISO and bracketing
1

mek42 wrote:

mostlyboringphotog wrote:

mek42 wrote:

Do the bodies with auto-ISO go above max ISO if needed for bracketing or exposure compensation?

I could try - I got recently interested in how auto-ISO and EC work - but what do yo mean by max ISO? The limit you set in the menu or the camera's max ISO rating 25600? Or even the expaneded ISO?

The menu limit.

So bracketing (same as applying Exposure Compensation) does not exceed the ISO limit set in Auto-ISO

In A mode - I observe that SS will be lowered to 1/FL, that is 1/80 sec for 70mm FL, then ISO is increased to the limit set, then the SS will be lowered to below 1/80 sec.

ISO will not exceed the limit set.

Lowering the SS takes precedence so that ISO may not reach the limit of ISO1600

i.e @70mm 1/400 f/5.6 ISO 400 + EC+3 -> 1/80 f/5.6 ISO 900

SS limit (overrided if limited by ISO limit set) is 1/FL second, the minimum SS for the FL.

Hope it helped. Other modes , S, P and M may work differently.

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Panasonic Lumix DMC-GM1 Pentax 645Z Nikon 1 J5 Fujifilm GFX 50R Canon EOS RP
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