Sigma Lens Auto Focus Not Working: Yesterday I went to the zoo and for some reason my Sigma 150-500 would not auto focus on my D4 or my D600. It worked fine the as recently as a week...

NikonKnight Loc: Owings Mills, MD

Yesterday I went to the zoo and for some reason my Sigma 150-500 would not auto focus on my D4 or my D600. It worked fine the as recently as a week before. Has anyone ever experienced this? Any thoughts on how to trouble shoot? I did try other lenses on my camera bodies and the auto focus worked fine so I'm pretty sure the problem lies with the lens. I've sent a message to Sigma. Thanks

JR1 Loc: Tavistock, Devon, UK

terminals on the camera and or lens need cleaning or camera needs a factory reset

cockney greg Loc: London E17

Dirty contacts on the lens?

NikonKnight Loc: Owings Mills, MD

cockney greg wrote:

Dirty contacts on the lens?

Any suggestions for the best way to clean the contacts? Should I attempt myself or send it in?

JR1 Loc: Tavistock, Devon, UK

NikonKnight wrote:

Any suggestions for the best way to clean the contacts? Should I attempt myself or send it in?

Yes

http://www.youtube.com/watch?v=DhZrfc3kZ8s

sportyman140 Loc: Juliette, GA

NikonKnight wrote:

Yesterday I went to the zoo and for some reason my Sigma 150-500 would not auto focus on my D4 or my D600. It worked fine the as recently as a week before. Has anyone ever experienced this? Any thoughts on how to trouble shoot? I did try other lenses on my camera bodies and the auto focus worked fine so I'm pretty sure the problem lies with the lens. I've sent a message to Sigma. Thanks

Hi, I would not send a message to Sigma. I would call them and then they will direct you to heir sight to locate the repair order forms and what you should do to get it fixed. Depending on what is wrong, I have a 70-300mm and mine had a similar problem. Followed their procedures and sent to them got it back 6 days later. Works great. Good Luck

NikonKnight Loc: Owings Mills, MD

sportyman140 wrote:

Hi, I would not send a message to Sigma. I would call them and then they will direct you to heir sight to locate the repair order forms and what you should do to get it fixed. Depending on what is wrong, I have a 70-300mm and mine had a similar problem. Followed their procedures and sent to them got it back 6 days later. Works great. Good Luck

Thanks sportyman140, I'll give that a try particularly since they haven't responded to my email yet!

sportyman140 Loc: Juliette, GA

Hi NikonNight,
It should be better for you seeing that you are in MD I live in GA which is allot further away. might even be quicker.

Here is their #: 1-800-896-6858

http://www.sigmaphoto.com/about-sigma/contact-us

mborn Loc: Massachusetts

Try using CRC contact Cleaner with a Q-tip to clean the contacts. I do my camera and lenses one a month. You would be surprised at the amount of dirt that accumulates on the contacts.

BTW Sigma repair is great and fast I sent a TC in that was broken and had it back in three days

Canikon Guy Loc: Baltimore, MD

NikonKnight wrote:

Any suggestions for the best way to clean the contacts? Should I attempt myself or send it in?

I do mine two ways:

1) Dampen a Q-Tip in alcohol. Not soaking wet.

2) Use an Ink pen eraser. The ones that are white with fine grit.
Rub the ink eraser lightly till the contacts are clean and shiny.

cameranut Loc: North Carolina

NikonKnight wrote:

Yesterday I went to the zoo and for some reason my Sigma 150-500 would not auto focus on my D4 or my D600. It worked fine the as recently as a week before. Has anyone ever experienced this? Any thoughts on how to trouble shoot? I did try other lenses on my camera bodies and the auto focus worked fine so I'm pretty sure the problem lies with the lens. I've sent a message to Sigma. Thanks

I am noticing that 9 times out of ten it won't auto focus at all. It tends to look like a blurry mess. I put it in manual focus & no problem. I thought at first it was caused by too many objects in front & behind the subject, but when I tried it today on a subject with no distractions; same thing, just a blur.

Acountry330 Loc: Dothan,Ala USA

Mine did the same thing. Quit working on my D-7000. So far not fixed. I so wish I could get that 6 day turn round that everyone talks about. They have had mine way to long. I hope to get it back this week. They say it was shipped last wed. So far no lens.

sportyman140 Loc: Juliette, GA

Acountry330 wrote:

Mine did the same thing. Quit working on my D-7000. So far not fixed. I so wish I could get that 6 day turn round that everyone talks about. They have had mine way to long. I hope to get it back this week. They say it was shipped last wed. So far no lens.

I'm sorry to hear about that, I do feel your pain.

igluewood

I have a Sigma 170-500mm that has the aperture is stuck at about 5.6. Don't know if the lens is worth sending it out to get fixed.