Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Nikon DSLR Cameras
D750
Nikon d750 AUTO ISO. My speculation
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="WayneF" data-source="post: 564448" data-attributes="member: 12496"><p>I think this was already covered in your recent thread at <a href="http://nikonites.com/d750/36412-how-your-auto-iso-flash-works.html#axzz4CQDzxdTC" target="_blank">http://nikonites.com/d750/36412-how-your-auto-iso-flash-works.html#axzz4CQDzxdTC</a></p><p></p><p>Speaking of D750 (and several recent models):</p><p> </p><p>If hot shoe flash, any Auto ISO increase with flash will be limited to 4x (2 stops, like from ISO 100 to ISO 400) above whatever Minimum ISO is set to.</p><p></p><p></p><p>This is easily seen and verified... Using camera Manual mode M (so that shutter speed and f/stop will not change), then simply reaching up and turning the flash on or off will see the Auto ISO changes just described above.</p><p></p><p></p><p>That is speaking of the recent camera models. Older models differ greatly, in two ways:</p><p></p><p>Initial iTTL models (D70 to D300 era) will never increase Auto ISO with any TTL flash. Makes sense, because we are using flash instead.</p><p></p><p>Intermediate age models (D300S until roughly just before the D800) will always increase Auto ISO for the ambient level for TTL flash. We might call this balanced flash, but which IMO makes absolutely no sense (see below about balanced flash).</p><p></p><p>Later models fix that and limit Auto ISO with hot shoe flash to 4x ISO increase, like to to ISO 400 is about right for bounce flash.</p><p></p><p></p><p>One ISO exception, for all models:</p><p></p><p>If the maximum flash power level is deemed insufficient for the TTL preflash measurement, Auto ISO will increase with any iTTL flash until the power level is deemed sufficient.</p><p></p><p></p><p>Balanced flash means that the flash level is adjusted down (less than metered flash exposure) so as to not overexpose the added combination with the metered ambient exposure.</p><p></p><p>The problem with indoor "balanced flash" is that indoor light is typically incandescent or fluorescent, which is typically orange or green, and this causes white balance problems mixing with white flash. To correct that situation, suitable color filters can be used on the flash to allow using incandescent of fluorescent white balance. But if not using the filters on the flash, balanced flash indoors may be about the last thing you'd want.</p></blockquote><p></p>
[QUOTE="WayneF, post: 564448, member: 12496"] I think this was already covered in your recent thread at [URL]http://nikonites.com/d750/36412-how-your-auto-iso-flash-works.html#axzz4CQDzxdTC[/URL] Speaking of D750 (and several recent models): If hot shoe flash, any Auto ISO increase with flash will be limited to 4x (2 stops, like from ISO 100 to ISO 400) above whatever Minimum ISO is set to. This is easily seen and verified... Using camera Manual mode M (so that shutter speed and f/stop will not change), then simply reaching up and turning the flash on or off will see the Auto ISO changes just described above. That is speaking of the recent camera models. Older models differ greatly, in two ways: Initial iTTL models (D70 to D300 era) will never increase Auto ISO with any TTL flash. Makes sense, because we are using flash instead. Intermediate age models (D300S until roughly just before the D800) will always increase Auto ISO for the ambient level for TTL flash. We might call this balanced flash, but which IMO makes absolutely no sense (see below about balanced flash). Later models fix that and limit Auto ISO with hot shoe flash to 4x ISO increase, like to to ISO 400 is about right for bounce flash. One ISO exception, for all models: If the maximum flash power level is deemed insufficient for the TTL preflash measurement, Auto ISO will increase with any iTTL flash until the power level is deemed sufficient. Balanced flash means that the flash level is adjusted down (less than metered flash exposure) so as to not overexpose the added combination with the metered ambient exposure. The problem with indoor "balanced flash" is that indoor light is typically incandescent or fluorescent, which is typically orange or green, and this causes white balance problems mixing with white flash. To correct that situation, suitable color filters can be used on the flash to allow using incandescent of fluorescent white balance. But if not using the filters on the flash, balanced flash indoors may be about the last thing you'd want. [/QUOTE]
Verification
Post reply
Forums
Nikon DSLR Cameras
D750
Nikon d750 AUTO ISO. My speculation
Top
