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A poll about Auto ISO action with hot shoe TTL flash
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<blockquote data-quote="voxmagna" data-source="post: 562963" data-attributes="member: 38477"><p>Thanks, I'm going to prove it for the shoe flash, but I thought there was always a pre-flash? Therefore shooting in a dark room should be o.k because the pre-flash should modify what the metering does before the flash(es) fire.</p><p></p><p>O.K I think I know where my problem is. The test is Aperture priority light room normal shots, then move into dark room, turn on flash. I have autoISO minimum set to 100 and max 3500 in the menu. In addition I use EasyISO to modify the ISO using the back command wheel. If I set the D750 minimum ISO100 in the menus, turn it on then frame a shot in the light room I get a daylight exposure at ISO100. Move to the dark room and ISO gets set to 400 4X, which is what I read. </p><p></p><p>However if I'm changing ISO on the fly in the light room, when I move to the dark room, flash off, the camera initially uses the last ISO setting up to the maximum set in the menu. Turn the flash on and it goes to 4X the last setting (which you forgot) hence being puzzled by seeing 2 different high ISO values. With flash turned on I then have to rotate the command wheel and watch the ISO update but it will never be less than ISO400.</p><p></p><p>I think when you use easyISO on the command wheel you are changing the base ISO and flash 'on' in the dark room will set to 4X that value. If I go in the dark room and rotate the command wheel down to ISO100 I then see the ISO400 setting for flash. If I want to use flash at ISO100 I have to turn off autoISO.</p><p></p><p>These cameras are too damn clever!</p></blockquote><p></p>
[QUOTE="voxmagna, post: 562963, member: 38477"] Thanks, I'm going to prove it for the shoe flash, but I thought there was always a pre-flash? Therefore shooting in a dark room should be o.k because the pre-flash should modify what the metering does before the flash(es) fire. O.K I think I know where my problem is. The test is Aperture priority light room normal shots, then move into dark room, turn on flash. I have autoISO minimum set to 100 and max 3500 in the menu. In addition I use EasyISO to modify the ISO using the back command wheel. If I set the D750 minimum ISO100 in the menus, turn it on then frame a shot in the light room I get a daylight exposure at ISO100. Move to the dark room and ISO gets set to 400 4X, which is what I read. However if I'm changing ISO on the fly in the light room, when I move to the dark room, flash off, the camera initially uses the last ISO setting up to the maximum set in the menu. Turn the flash on and it goes to 4X the last setting (which you forgot) hence being puzzled by seeing 2 different high ISO values. With flash turned on I then have to rotate the command wheel and watch the ISO update but it will never be less than ISO400. I think when you use easyISO on the command wheel you are changing the base ISO and flash 'on' in the dark room will set to 4X that value. If I go in the dark room and rotate the command wheel down to ISO100 I then see the ISO400 setting for flash. If I want to use flash at ISO100 I have to turn off autoISO. These cameras are too damn clever! [/QUOTE]
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A poll about Auto ISO action with hot shoe TTL flash
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