Tamron 17-70 Stopped Changing Aperture

miles500 wrote:

Further to my earlier post when I described the behaviour of the 17-70 on my XT5 when turning past f22 puts the camera into P mode with seemingly no means of changing the aperture - I tried the lens on my XS10 and was surprised to see that a further turn of the front command dial has no effect at all and the camera therefore does not change to P mode. I find it odd that the lens behaves differently on the XS10.

When i remounted my 17-70 to the XT5, to my dismay I found that the camera was stuck in P mode and the front command dial was inoperative - this is I think what happened to Batdude. I tried switching on and off with no improvement. Only when I switched the exposure compensation dial away from the C position, did the front command dial operate the aperture as it should. Oddly enough when I then reset the EC dial to C , the front command dial continued to operate normally. I conclude from all this that there is some sort of issue which concerns the operation of the EC dial and the front command one. This is all beyond me!

Hi

I just tried this on my xt4 with the 17-70

ISO and shutter dials set to 'A'.

EC dial set to 'C'

The camera indicated 'A' mode for aperture priority.

I turned the front aperture dial all the way past f22 so the mode changed to 'P' for program mode. The aperture display turned white and went to f2.8

I then rotated the front dial back to f22 and it changed back to blue and I was able to continue to adjust the aperture and the camera indicated 'A' mode on the rear screen.

My Tamron is at firmware 2.01

Xt4 is at 1.6

I removed and re-attached the lens and was still able to move it out of p mode with the front aperture dial.

So I'm not seeing the same behaviour you're experiencing on the xt5.

Have you tried with a Fujifilm lens that does not have an aperture thing? I tried with the original 27mm 2.8 and it also behaves like my Tamron, that is, thus far, no issue.

On my xs10 it behaved the same as you described.  This camera has a pasm dial so you would need to turn that dial to 'P' to go into program mode. So turning the aperture dial beyond f22 should not be an option otherwise it would conflict with the pasm dial.

I guess my post doesn't help the OP sadly but if he does have the same issue as you found then that would be something.

Cheers

Paul