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- Chris Summers
About 15 months ago I purchased the RF 100-500mm lens and put my old but faithful Tamron 150-600mm G2 lens on a shelf in my gear closet. I recently decided to sell it as it's not going to get much more use so I put it on my R7 to test. Low and behold, it won't focus properly, it attempts focus and stops but nothing is anywhere near sharp. And if I manually focus and then push the shutter button it jumps back out of focus.
Another odd thing is that at 150mm the Info screen says wide open is f/9, not f/5. Once I move it away from 150mm the aperture reads normally from f/5 to f/6.3. And I will add that I tried it also on my R6 MkII and used both of my EF-RF Canon adapters with the same results so I think it is a lens issue.
I ran the scenario through Claude, my AI friend. It said it might be a firmware failure and asked if I have the Tamron TAP console to reset firmware. I don't and a used one would cost me $60 or so. Claude also suggested it could be the gold contact at the mount or a failed ribbon cable inside the lens. It suggested since the lens functions to some extent it most likely was not a major component like a circuit board.
In the end I decided to send it to Tamron for inspection and if not too expensive to repair. I am VIP Silver with Tamron so I get a 10% discount on service and free return shipping on repaired items. I figure if it is something as simple as firmware it's still worth having them do it and certify the lens is working correctly, and they will send it back all cleaned up. I see used models in similar excellent condition selling for $800-$1000 so I would still make some profit if the repair cost is not super high.
Another odd thing is that at 150mm the Info screen says wide open is f/9, not f/5. Once I move it away from 150mm the aperture reads normally from f/5 to f/6.3. And I will add that I tried it also on my R6 MkII and used both of my EF-RF Canon adapters with the same results so I think it is a lens issue.
I ran the scenario through Claude, my AI friend. It said it might be a firmware failure and asked if I have the Tamron TAP console to reset firmware. I don't and a used one would cost me $60 or so. Claude also suggested it could be the gold contact at the mount or a failed ribbon cable inside the lens. It suggested since the lens functions to some extent it most likely was not a major component like a circuit board.
In the end I decided to send it to Tamron for inspection and if not too expensive to repair. I am VIP Silver with Tamron so I get a 10% discount on service and free return shipping on repaired items. I figure if it is something as simple as firmware it's still worth having them do it and certify the lens is working correctly, and they will send it back all cleaned up. I see used models in similar excellent condition selling for $800-$1000 so I would still make some profit if the repair cost is not super high.
