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<blockquote data-quote="WayneF" data-source="post: 379810" data-attributes="member: 12496">I am puzzled, because the Metz 52 flash ought to be compatible with Nikon CLS communication, so camera should have recognized the flash was present on the hot shoe.&nbsp; For iTTL to work, it has to.&nbsp;&nbsp; And I thought D600 is a newest model which limited the Auto ISO increase with flash to only two stops (ISO 400).Guessing, but probably the Metz 52 is a model that includes a specific menu for TTL vs TTL BL mode.&nbsp; (Metz does that much better than Nikon today.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; )&nbsp; So with high ISO, the ambient is &quot;normally exposed&quot;, and TTL BL will default to be fill flash and will back off, and will not overexpose subject in bright ambient.&nbsp; However, TTL mode will&nbsp; overexpose in significant ambient, with the proper ambient exposure, and the proper TTL flash exposure, which sum is 2x proper exposure, which is 1 stop overexposed.&nbsp; My guess is that explains the overexposure, but does not explain why the Auto ISO was so high on a D600.</blockquote>

[QUOTE="WayneF, post: 379810, member: 12496"] I am puzzled, because the Metz 52 flash ought to be compatible with Nikon CLS communication, so camera should have recognized the flash was present on the hot shoe. For iTTL to work, it has to. And I thought D600 is a newest model which limited the Auto ISO increase with flash to only two stops (ISO 400). Guessing, but probably the Metz 52 is a model that includes a specific menu for TTL vs TTL BL mode. (Metz does that much better than Nikon today. :) ) So with high ISO, the ambient is "normally exposed", and TTL BL will default to be fill flash and will back off, and will not overexpose subject in bright ambient. However, TTL mode will overexpose in significant ambient, with the proper ambient exposure, and the proper TTL flash exposure, which sum is 2x proper exposure, which is 1 stop overexposed. My guess is that explains the overexposure, but does not explain why the Auto ISO was so high on a D600. [/QUOTE]

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