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Don't know how to use or broken?

I bought a vintage Tokina 70-210mm F3.5 lens few weeks back. It was great for the money (~30eur) but now the aperture doesn't work right, while disconnected from the body (D3300) it works fine, though I first need to move the aperture lever. When I put it on the body aperture either moves from like 3.5 to 5.6 or is stuck at single aperture (not always the same). I didn't try to disassemble it, didn't drop it, it just stopped working right after I put it on the body. I used this lens for at least a few weeks and it worked fine. Do I have to do something with the aperture lever (I tried putting it in different positions before mounting)? I tried my kit 18-55mm on body and it worked fine so I don't think it's my body (though these are VERY different lenses). I can provide pictures/video if needed (with my crappy phone). Thanks for any help! :)

Lenovo Y50 (i7-4710HQ, 1TB SSHD, 16GB RAM, 860m 4GB), Nikon D3300 (lenses: 18-55mm kit, Tokina 70-210mm vintage)

P.S. Sorry for my bad english :/

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The first thing I can suggest is to check that the lens is correctly oriented on the body. Usually there will be a red dot on the lens and the body that has to be aligned.

 

On my old lenses, the aperture lever would open the aperture completely when looking through the viewfinder, then when taking the picture the lever would be released by the camera and the aperture would move to the amount indicated by a ring near the end of the lens. It might be that you need to adjust that ring to the aperture you want. 

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The first thing I can suggest is to check that the lens is correctly oriented on the body. Usually there will be a red dot on the lens and the body that has to be aligned.

 

On my old lenses, the aperture lever would open the aperture completely when looking through the viewfinder, then when taking the picture the lever would be released by the camera and the aperture would move to the amount indicated by a ring near the end of the lens. It might be that you need to adjust that ring to the aperture you want. 

It mounts just fine, I know that the aperture doesn't adjust when using viewfinder.

I'm 100% that the aperture isn't working as it should, because 3.5 - 5.6 apertures work just as before but all the other aperture settings don't work, it just stays the same as previous. I think it's something went wrong with the lever. I don't think there are any settings in camera for aperture or aperture lever.

 

I'll try to post a video of how the back of the lens and aperture works/looks maybe I'm describing it badly :/

 

Thanks for your help though :) 

Lenovo Y50 (i7-4710HQ, 1TB SSHD, 16GB RAM, 860m 4GB), Nikon D3300 (lenses: 18-55mm kit, Tokina 70-210mm vintage)

P.S. Sorry for my bad english :/

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what body are you using?

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Sounds like an internal lever issue with the lens. Definitely wouldn't be an issue with the body since that lens is a non pin model from my recollection. That model is the f/3.5 constant right? Does it say constant through the zoom? What happens when you change the diaphragm off body and put it on? 

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