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Sigma lens doesn’t stop down with adapter


Fiodor

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I have this adapter FotodioX Lens Mount Adapter for Nikon G-Type F-Mount Lens to Fujifilm X-Mount Camera and I can use Nikon AF lenses on my Fuji XT3 and change the aperture with the ring.

 

But I can’t stop down this AF Sigma lens for Nikon Sigma Zoom Telephoto 70-300mm f/4-5.6 APO DG Macro Autofocus Lens for Nikon AF-D It is always at the wider aperture.

 

What is the Sigma lens lacking? Can I do something to make the aperture ring work?

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I just saw that when I turn the aperture ring, I don’t see any diaphragm closing in the lens.

 

The adapter I have can work with Nikon G lenses (without aperture ring) by changing the position of a ring. But this Sigma lens can’t stop down even if I change the position of that ring (it is not a G lens, it is something different).

 

So, I guess it is impossible to stop it down…

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Thank you!

 

I tried the lens with a Nikon D80 and first, I didn’t get different exposures when I changed the aperture (I have to set the aperture ring at 22 and then dial the aperture on the D80). The EXIF was recorded with different F number, but the exposure was the same.

 

But then, after some photos and fiddling around with the manual/auto focus switch, the problem was solved (now the aperture changes the exposure).

 

So, after that, I removed the lens and I could see the diaphragm at the aperture set on the aperture ring. I discovered the lever, which I didn’t know before, and if I push the lever, the diaphragm opens.

 

So… Should I try the lens again with the adapter and the Fuji camera? Is the adapter doing something wrong to the lens?

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Sounds like the Sigma lens initially had a stuck aperture, or the lever in the adapter wasn't moving the lever in the lens.

 

Either way; it must have been a purely mechanical issue, since there's no electronic control of the lens aperture, and no electrical passthrough connection in the adapter.

 

Could the aperture blades in the lens have stuck with oil? That's a fairly common problem.

 

FWIW, I have a similar Sony E to Nikon G adapter. The aperture is controlled by a rotating ring on the adapter, and a non-G lens has to be set to minimum aperture, or to the desired aperture. It's easy to knock the adapter ring to the wide open position or to forget to stop the lens right down. Either of these result in a wider than expected aperture.

Edited by rodeo_joe|1
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Previously, I tried this Sigma lens twice with the adapter and the XT3, and I wasn’t able to stop down.

 

But now I can. And I realized that the lens must be inserted only when the adapter ring is on one side (and not on the other side). Both times I tried previously, I imagine I must have inserted it with the ring on the wrong position. I really don’t know if that is possible. But if it is, I did in a way that pushed the lever in a way that block or cause trouble to the lever.

 

I am just guessing…

 

But the important thing is that the problem was solved.

 

Thank you!

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My PhotodioX Canon to Sony adapter wasn't working with my Tamron 70-300 and Canon 85/1.8. Was working with Canon 24-70/2.8.

Its hit and miss situation.

 

Have you called Tamron Support and asked if there is a firmware update for your lens? There may not be depending upon the age of the lens, but I have always found Tamron support very helpful.

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Have you called Tamron Support and asked if there is a firmware update for your lens? There may not be depending upon the age of the lens, but I have always found Tamron support very helpful.

I sold all Canon lenses anyway, and its not Tamron problems, its adapter problems.

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