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A7II & 55mm 1.8 - weird issue

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Satisfied Fool

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Hi guys, new to the forum. I'd like to ask for some advice.

 

I just bought a second hand 55mm 1.8 which is in absolute gorgeous condition. It was working great when I bought it, no issues. Now I've run in to a problem, and I think it lies with my A7ii rather than the lens.

 

I noticed that the aperture was constantly adjusting. Like it was changing based on the light input. So when I aimed my camera at a dark spot, the aperture would go wide open, and when I aim at a light spot, it starts adjusting and stopping down. All this without me touching anything on the camera. First I tried changing settings, turning of Pre-AF, Cont. AF, Effects Settings etc. Still the same problem, in all the different shooting modes.

 

The seller was very helpful, and surprised, and advised me to look at the lens connectors and reset the camera. The connector points look fine, and a camera reset worked. The lens was behaving like it was supposed to. This was last night. Now I just woke up, took the camera and turned it on. You can already guess... Same problem as before. Did another reset, and it's fine again.

 

Does anyone have an idea what this problem can be? Am I correct that it is a problem with my body rather then the lens?

 

I've made a short video of the issue: https://drive.google.com/file/d/0B1If3aqGEkIcTU5wTDBUdnlsN0E/view?usp=drivesdk

 

In the video it also produces quite a bit of sound, but this is mostly gone when the lens is working correctly. Just a small amount of sound with focussing.

 

Any help is highly appreciated!

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michelb Community Regular

michelb

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Posted

If you were in any auto exposure mode ( Auto, iAuto, P or S modes) this is normal since the camera is trying to adjust the aperture to the changing lighting conditions

 

If it does it in Manual Exposure mode, the camera will sometimes do this to help the AF system to find focus on darker scenes

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