Comments on: An Unfortunate Sigma “Bigma” Enigma

By: parv

parv — Thu, 17 Jun 2010 08:00:57 +0000

Sigma issued a statement about AF issue affecting some of the zooms …

http://www.sigma-photo.co.jp/english/news/info_100616.htm

… affected lenses & serial numbers are …

APO 50-500mm F4.5-6.3 DG OS HSM Serial Number between 10633051 and 10972000
APO 120-400mm F4.5-5.6 DG OS HSM Serial Number between 10574001 and 10972000
APO 150-500mm F5-6.3 DG OS HSM Serial Number between 10674301 and 10972000

Yeah, I saw that on DPReview today, and checked my new lens, and it’s within the range. They say they’ll fix it if you experience the problem, which I haven’t with the new one, but then, I’ve been so busy lately that I haven’t had a chance to really use it, beyond one day at KidZania —Jeffrey

By: Daniel Cutter

Daniel Cutter — Mon, 10 May 2010 11:26:40 +0000

I’ve had similair problems with my Sigma 18-250. I thought it was missing contact between lens and camera. I was about to send it in and then the problem stopped. It did start again but cleaning the flange helped. It looks like a quality control problem. Still don’t know if I’ll send it in or not.

By: Steve Friedl

Steve Friedl — Sat, 08 May 2010 03:04:47 +0000

So, are you creating a Sigma Bigma Enigma stigma?

By: Drew

Drew — Fri, 07 May 2010 10:51:26 +0000

I’ve tried two Sigma lenses and have had similar wonkiness where the focus just seems to completely crap out and won’t lock again until I detach and re-attach the lens. The OS stopped working on one as well. Needless to say they both went back and I’ve just been sticking to Canon ‘L’ glass since.

By: parv

parv — Fri, 07 May 2010 09:17:24 +0000

Did the wonkiness manifest without the teleconverter also (going by “… you know you’re zoomed at 1,000mm”)?

Yes, it happened with or without the TC. —Jeffrey