Error message F-- Lens not attached

[arthurking83]

I might add, that the eraser is the soft rubber type & is very effective in removing that 'tarnish' appearance on the contacts. .....

eraser fixed my Siggy 10-20 with only 1 light pass.
I had the same issue that TG has while I was out'n'about where the camera would basically lockup.
Remove lens, refit .. it helped a couple of times, but it was all over the place.

@ home, I did the eraser thing and have never had trouble with the Siggy ever since.

The contact cleaner fixed my Tamron 28-75 issue.
I only used the contact cleaner because I discovered that I had some left over! Otherwise I'd have just used the eraser again.
Contact cleaner sprayed onto a cotton bud so it was wet. cotton bud swiped over contacts on the wet side, then a very light swipe on the dry side, you don't want lint coming off, so just a light drying action. In fact it doesn't really need it, I just did it.
Never had an issue with the Tammy again either.

ps. I'm also going colourblind. I thought that most lens contacts are gold coloured, but are in fact a silvery silver colour, whereas the Sigma's are different using a dark coloured finish.

[Ross the fiddler]

...........

ps. I'm also going colourblind. I thought that most lens contacts are gold coloured, but are in fact a silvery silver colour, whereas the Sigma's are different using a dark coloured finish.

My Sigma 150mm macro lens appears to be gold, but I've had gold contacts on pc boards etc go dull & can even get a dark bronze appearance. The rubber cleans that up nicely & then I use alcohol, isopropyl preferably, but metho will do if buffed dry afterwards.

[thegrump]

Nothing seemed to be working, so I took off the piece from the lens with the ball like connections. I took the whole center out, then realized you could take the single piece out. I gave the connections a tap from the back, then reassembled the thing. It is working, or at least for the last couple of hours. I have taken the lens off and reconnected it a dozen times. I am crossing my fingers that it stays that way.

[ameerat42]

Congs, TG.

[arthurking83]

If you have taken the mount apart and then put together again and it's working, then most likely a connection issue to the CPU.
The CPU is what allows the camera to recognise the lens.

So the ribbon connection to the CPU is mostly likely failing, not the contacts themselves.
The ribbon connection is quite fragile(very thin wires) and almost certain to be solder joints playing up.

[Hawthy]

I had to Google "congs" but agree, congs 2u TG.