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I have a D3400 and recently I haven't been able to change the aperture on any of my lenses in manual mode. I have lenses with aperture rings and if I set the aperture to anything below the largest aperture such as f/16 and put it on the camera, the aperture opens back up to f/1.4 by itself.

RThis problem just started. Every lens that I use is unable to change aperture. If I mount the lens, the aperture is forced wide open, even if it's set to f/16 on the lens. And once I remove the lens, the lens closes back to f/16.

  • I don't have anything with an aperture ring that isn't a full manual lens, but my guess would be that the camera is 'in charge'. What happens if you mount the lens, set to f/16 then detach & remount? Additionally what happens if you mount another lens in between those events, with & without changing aperture from the camera? – Tetsujin Jul 22 at 7:42
  • What lenses? Did this just start or is it a problem that's been like that from when you got the camera? – mattdm Jul 22 at 9:00
  • This problem just started. Every lens that I use is unable to change aperture. If I mount the lens, the aperture is forced wide open, even if it's set to f/16 on the lens. And once I remove the lens, the lens closes back to f/16. – Elvis Ma Jul 22 at 9:22
  • @ElvisMa - with the lens mounted and set on f/16 (but with the lens aperture wide open), what happens when you press the shutter? – ItWasLikeThatWhenIGotHere Jul 22 at 9:38
  • Are you trying to change aperture when looking through the viewfinder, or are you using live view? Are you in photo mode, or movie mode? – scottbb Jul 22 at 10:29
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According to Ken, aperture ring compatibility was "missing" on the D3400, while the D3300 (and earlier) had some support for lenses with aperture rings.

I've used a D3200 with lenses with an aperture ring, but unless the aperture is set to the smallest (largest number), the camera gives an error message - and this only applies to lenses with at least partial support of automatic aperture. (In this case the lens will be wide open until the shutter is released or the preview button pressed.)

It sounds like this might no longer be the case on the D3400. The answer here might also be useful,

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    But I was able to use the aperture ring before today – Elvis Ma Jul 22 at 9:18
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    @ElvisMa - How did you use it previously (ie. what did you do and what did you see)? The 3*** series doesn't have the rotating ring around the lens mount that engages with the aperture ring on the lens, and I've not been able to vary the aperture using the ring on the D3200 as I would with other (eg. D810) Nikons. – ItWasLikeThatWhenIGotHere Jul 22 at 9:33
  • Previously, I was able to turn the aperture ring and I could see the image get darker or brighter through the live view. – Elvis Ma Jul 22 at 19:41
  • @ElvisMa that is very interesting. Here's the thing: when in live view, the camera can't physically change the aperture. So in order to "see the image get darker or brighter though the live view", it was simulating that through brightening or darkening the image on the LCD. But it certainly wasn't changing the aperture while in live view. But once you took the image by pressing the shutter button, the correct exposure settings that you specified were used, resulting in the desired image being taken. – scottbb Jul 22 at 20:02
  • @scottbb The lenses I'm using are manual focus and manual aperture – Elvis Ma Jul 23 at 1:18

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