Sigma 70-300 giving F-- problem

fishy · 05-22-2009, 08:21 PM

Hi all,

I know this has been posted before, but I have not been able to solve this issue; hopefully you can help me out..

What happens is that sometimes, and intermittently, when I have my Sigma 70-300 mounted, my K10D seems to lose the aperture control over the lens; it shows an aperture "F--" (like on M lenses). If I fiddle with the lens a bit it comes back..

I have cleaned the contacts, on both lens and camera, and checked the mountscrews.. Nothing there. I hope this is not the end of my Sigma, I really like this lens! Any help appreciated.

Thanks!

casualshooter · 05-22-2009, 09:07 PM

make sure your aperture on the lens is set to "A".
Or it could be a loose contact on the lens itself.

good luck

fishy · 05-22-2009, 11:03 PM

Yeah, aperture ring is set to A allright... If it were a loose contact, I wonder if that would be user serviceable, since I am quite a bit away from any service-center... Has anyone had success fixing this?

05-22-2009, 08:21 PM	#1
fishy Senior Member Join Date: Aug 2007 Location: Brussels Photos: Gallery Posts: 199	Sigma 70-300 giving F-- problem Hi all, I know this has been posted before, but I have not been able to solve this issue; hopefully you can help me out.. What happens is that sometimes, and intermittently, when I have my Sigma 70-300 mounted, my K10D seems to lose the aperture control over the lens; it shows an aperture "F--" (like on M lenses). If I fiddle with the lens a bit it comes back.. I have cleaned the contacts, on both lens and camera, and checked the mountscrews.. Nothing there. I hope this is not the end of my Sigma, I really like this lens! Any help appreciated. Thanks!

05-22-2009, 09:07 PM	#2
casualshooter Inactive Account Join Date: May 2009 Location: singapore Posts: 8	Sigma 70-300 giving F-- problem make sure your aperture on the lens is set to "A". Or it could be a loose contact on the lens itself. good luck

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05-22-2009, 11:03 PM	#3
fishy Senior Member Join Date: Aug 2007 Location: Brussels Photos: Gallery Posts: 199 Original Poster	Yeah, aperture ring is set to A allright... If it were a loose contact, I wonder if that would be user serviceable, since I am quite a bit away from any service-center... Has anyone had success fixing this?

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