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Hi there I'm looking for some help with a problem I think I might have with my Sigma 17-70 mm f2.8-4.5 Macro DC lens.
I bought this lens at the end of February from the Jacobs stand at Focus on Imaging at the NEC along with a Canon EOS 400D. After using the lens for a while I noticed that there appeared to be a small stain on the surround to inner front lens element. The stain appears to be a liquid of some type (lubricant?), initially this was quite small but over the past 2 1/2 months has now grown to encompass about 1/2 of the surround and was hoping someone could tell me what it is and whether I have a faulty lens?
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I would just phone up jacobs and email them the photo. I'm sure they will replace it without question. Don't accept a repair.
As it is not on the optic is this an issue? And are you certain it has not come into contact with something that is causing this. Best take it t odealer if you are worried. Or EMAIL Sigma for a comment. If a simple clean fixes it take it.
After all it is not like the glass is damaged
Thanks for all your help and advice. Sigma have confirmed that this is a lubricant leak and since its on the inner lens element surround I've had to send it back to them for repair (or preferably replacement).
I have to say that apart from this issue I've found the 17-70 mm to be a cracking walk about lens (it produces great pseudo-macro shots as well) the problem is I might be without my standard lens for up to 3 weeks :-(
PS I've removed the shot of the staining on the lens from my gallery
Just to close off this thread. I sent the lens back to Sigma last Tuesday and after being repaired it was delivered to my home today. Considering the holiday weekend, I think that's excellent service as they turned the lens around in a couple of days (thank goodness as I felt as if I was missing my right arm!)
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