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Nikon DSLR Cameras
D500
D500 USED WITH FLASH AND AUTO-ISO : problems ???
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<blockquote data-quote="Horoscope Fish" data-source="post: 635342" data-attributes="member: 13090"><p>I think this lies at the heart of why you think your D500 is not functioning correctly. The camera can't know what ISO is needed for proper exposure with the flash, until the flash fires a pre-flash. The camera uses the light reflected from the pre-flash AND the degree of ambient light, and meters for the total amount of light that will be passing Through The Lens (TTL) and hitting the sensor. Based on all that data Auto-ISO determines which particular ISO to use to obtain proper exposure. Both minimum and maximum ISO's are determined by you in the Auto-ISO menu. You determine in that specific menu what <em>range</em> of ISO values the camera is permitted to use. If you don't want it using ISO12800, set a lower maximum ISO value in the Auto-ISO menu. </p><p></p><p>Now, it just so happens your camera, and many other Nikon cameras, use a baseline of 4 times the minimum ISO as has been set in the Auto-ISO menu. You have ISO100 set as your minimum ISO so the camera uses ISO<strong>400</strong> as the starting point because that's simply how Auto-ISO has been configured to work. Love it or hate, that's simply what it does; I mean, it has to start somewhere, right? Further, if and when the meter determines there is a whole lot of ambient light your camera "assumes" a lower ISO may work since it "knows" the flash is also available. It can't know precisely what ISO to use until it gathers all the necessary data, however and that necessary data is provided via the pre-flash from the flash in operation, whether that's the on-board flash or one mounted in the hot-shoe. Know also Auto-ISO does attempt use the lowest ISO it "thinks" it can get away with, while still providing proper exposure and working with the range you have set in the Auto-ISO menu.</p><p> </p><p><span style="color: #FFFFFF">.....</span></p><p></p><p>Exactly. It really is much easier, and gives better results (not only in my experience but also in the experience of many, <em>many</em> others who know this stuff far better than I)), to manually select a workable ISO and use things like Exposure Compensation (EC), Flash Exposure Compensation (FEC) and manually adjusting flash output to get the exact exposure desired.</p><p></p><p>If you're still convinced your D500 is not functioning correctly, I can only suggest you send it to a Nikon service-center for evaluation.</p><p></p><p><span style="color: #FFFFFF">.....</span></p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 635342, member: 13090"] I think this lies at the heart of why you think your D500 is not functioning correctly. The camera can't know what ISO is needed for proper exposure with the flash, until the flash fires a pre-flash. The camera uses the light reflected from the pre-flash AND the degree of ambient light, and meters for the total amount of light that will be passing Through The Lens (TTL) and hitting the sensor. Based on all that data Auto-ISO determines which particular ISO to use to obtain proper exposure. Both minimum and maximum ISO's are determined by you in the Auto-ISO menu. You determine in that specific menu what [I]range[/I] of ISO values the camera is permitted to use. If you don't want it using ISO12800, set a lower maximum ISO value in the Auto-ISO menu. Now, it just so happens your camera, and many other Nikon cameras, use a baseline of 4 times the minimum ISO as has been set in the Auto-ISO menu. You have ISO100 set as your minimum ISO so the camera uses ISO[b]400[/b] as the starting point because that's simply how Auto-ISO has been configured to work. Love it or hate, that's simply what it does; I mean, it has to start somewhere, right? Further, if and when the meter determines there is a whole lot of ambient light your camera "assumes" a lower ISO may work since it "knows" the flash is also available. It can't know precisely what ISO to use until it gathers all the necessary data, however and that necessary data is provided via the pre-flash from the flash in operation, whether that's the on-board flash or one mounted in the hot-shoe. Know also Auto-ISO does attempt use the lowest ISO it "thinks" it can get away with, while still providing proper exposure and working with the range you have set in the Auto-ISO menu. [COLOR="#FFFFFF"].....[/COLOR] Exactly. It really is much easier, and gives better results (not only in my experience but also in the experience of many, [I]many[/I] others who know this stuff far better than I)), to manually select a workable ISO and use things like Exposure Compensation (EC), Flash Exposure Compensation (FEC) and manually adjusting flash output to get the exact exposure desired. If you're still convinced your D500 is not functioning correctly, I can only suggest you send it to a Nikon service-center for evaluation. [COLOR="#FFFFFF"].....[/COLOR] [/QUOTE]
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D500 USED WITH FLASH AND AUTO-ISO : problems ???
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