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Photography Q&A
(newbie) Need some help getting a ring flash to work
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<blockquote data-quote="BF Hammer" data-source="post: 840511" data-attributes="member: 48483"><p>I think I see 2 problems here. First is over-exposing, the other is the difficulty with making autofocus work. I don't believe they are related (entirely).</p><p></p><p>I am looking at the Kenro web site at that particular flash. It does say TTL, but that is not actually iTTL. Could be a misuse of the term in translation, but iTTL puts out a pre-flash before main exposure so the auto-exposure can measure the power needed. TTL mode just keeps the light on until exposure is judged correct and then it shuts off. The shutter stays open for the full 1/200 or 1/250 the entire time in either case (this is not a universal thing for all cameras). This is why old 1990s flash units don't work auto-mode on DSLR camera bodies, no pre-flash for iTTL.</p><p></p><p>I suspect it is really supposed to say iTTL on the flash specs, but I don't know. Assuming that it is, then you will have to dive into the manual for the flash. And I think you should do that anyhow for the next problem.</p><p></p><p>The reason you cannot autofocus is you are not using the modeling light. The D3300 has a built in LED light on the camera body that is used for autofocus assist in low light. It can be turned on or off in the setup menu, it should be A9 of the setup menu. But I only found the D3500 manual online, but I expect it will be there on the D3300. <a href="https://onlinemanual.nikonimglib.com/d3500/en/14_menu_02_07.html" target="_blank">https://onlinemanual.nikonimglib.com/d3500/en/14_menu_02_07.html</a></p><p></p><p>However it looks like the ring flash is big enough to block that AF illuminator from the subject. For that reason there are LED modeling lights in the ring light (read that on the Kenro web page) which might not be working when you do your half-press of the shutter release to acquire focus. You will have to read the manual for the ring light to look why that is not happening. The modeling lights at macro distance would be perfectly bright enough for the autofocus sensor to operate.</p><p></p><p>Also to throw in the mix is the minimum focus distance spec. For that 105mm lens, you must be at least 12 inches away from the subject, and best to be a bit further back than that.</p></blockquote><p></p>
[QUOTE="BF Hammer, post: 840511, member: 48483"] I think I see 2 problems here. First is over-exposing, the other is the difficulty with making autofocus work. I don't believe they are related (entirely). I am looking at the Kenro web site at that particular flash. It does say TTL, but that is not actually iTTL. Could be a misuse of the term in translation, but iTTL puts out a pre-flash before main exposure so the auto-exposure can measure the power needed. TTL mode just keeps the light on until exposure is judged correct and then it shuts off. The shutter stays open for the full 1/200 or 1/250 the entire time in either case (this is not a universal thing for all cameras). This is why old 1990s flash units don't work auto-mode on DSLR camera bodies, no pre-flash for iTTL. I suspect it is really supposed to say iTTL on the flash specs, but I don't know. Assuming that it is, then you will have to dive into the manual for the flash. And I think you should do that anyhow for the next problem. The reason you cannot autofocus is you are not using the modeling light. The D3300 has a built in LED light on the camera body that is used for autofocus assist in low light. It can be turned on or off in the setup menu, it should be A9 of the setup menu. But I only found the D3500 manual online, but I expect it will be there on the D3300. [URL]https://onlinemanual.nikonimglib.com/d3500/en/14_menu_02_07.html[/URL] However it looks like the ring flash is big enough to block that AF illuminator from the subject. For that reason there are LED modeling lights in the ring light (read that on the Kenro web page) which might not be working when you do your half-press of the shutter release to acquire focus. You will have to read the manual for the ring light to look why that is not happening. The modeling lights at macro distance would be perfectly bright enough for the autofocus sensor to operate. Also to throw in the mix is the minimum focus distance spec. For that 105mm lens, you must be at least 12 inches away from the subject, and best to be a bit further back than that. [/QUOTE]
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(newbie) Need some help getting a ring flash to work
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