Hi Lea, You probably just wore it out, it does happen. The Tamrons are built much better than the Sigmas, but try and find a Canon 24-70 2.8L or the 24-105 f4L, both are mainstays in my kit and the 24/105 is great for portraits. If you want a fixed FL the 85mm 1.4 cannot be beat. The images quality and bokah are the very best that Canon has to offer and will blow away anything else you have put in front of your camera. I suggest renting from my friends at borrowlenses.com prior to your purchase. Yes the Canon lenses are more expensive than aftermarket glass. but I have NEVER had one fail on a shoot. My 70-200 2.8 used to be a rental prior to my owning it, it has been in 5g dives, vibrated against all manner of machines and hit by an overthrown baseball at a Giants game, still keeps on ticking. Lots of folks may chime in about this or that Sigma or Tamron. I would think that many doe not have cameras and w/ lenses that are over 250,000 frame shot under harsh conditions. Canon L series lenses are just that much better. I sold Canon and the other stuff too. But the real difference is the build quality and the images it helps you to create. There is a real reason the aftermarket stuff is cheaper. Cheers, Les -----Original Message----- >From: Lea Murphy <lea@xxxxxxxxxxxxxxxxx> >Sent: Jan 28, 2009 3:11 PM >To: List for Photo/Imaging Educators - Professionals - Students <photoforum@xxxxxxxxxxxxxxxxxx> >Subject: Re: good lens gone bad? > >Wow. Very helpful information. > >Thank you so much. > >Lea >On Jan 28, 2009, at 2:08 PM, Mark Blackwell wrote: > >> Ok Lea You have definitely identified the source of the problem. >> If the lens won't work on another body and another lens will work on >> the body that had the problem, its definitely the lens. But there >> are a couple of things to check. >> >> First look real close at all the contacts and re clean them if >> possible. Years ago I had one go funky and I cleaned the contacts >> on the body, but not the lens. The gunk was on the lens contacts. >> Check for damage to pins, but you likely have already done both. >> >> Before I sent it back to the factory, Id check around for a local >> repair man/person to take a look at it. IF there is anything that >> they can do with it, its likely going to save you some down time. >> Yes contacts could go bad. The grinding though to me sounds like it >> might be something internal that has gone bad that is demanding more >> voltage than the body expects. The camera sensing the need for >> excess voltage suspects that something is in the way of the current >> causing the clean contacts message. I don't know how easy it would >> be to get to replace a motor or gears and hopefully it isn't that. >> Yet the good local guy could likely tell you with just a listen, if >> there is one near you and give you good sound advise on how to >> proceed. >> >> >> --- On Wed, 1/28/09, Lea Murphy <lea@xxxxxxxxxxxxxxxxx> wrote: >> >>> From: Lea Murphy <lea@xxxxxxxxxxxxxxxxx> >>> Subject: Re: good lens gone bad? >>> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxx >>> > >>> Date: Wednesday, January 28, 2009, 11:53 AM >>> It's a Tamron. >>> >>> I have two of the exact same lens...it's a 28-70mm >>> f/2.8. >>> >>> I put the second one on and all is well. >>> >>> The first one still won't work. >>> >>> Lea >>> >>> On Jan 28, 2009, at 11:46 AM, rebphoto wrote: >>> >>>> What brand of lens? >>>> >>>> I had a Sigma lens that worked fine >>>> for over a year with my 10d and >>>> then decided not to talk with the camera >>>> anymore. Kept giving the error 99. >>>> >>>> I gave it to a friend. >>>> >>>> He sent it to Sigma and for about $10.00 >>>> they did something so it would talk to his >>>> Canon Rebel. >>>> >>>> Russ >>>> R.E. Baker >>>> Photography >>>> rebphoto@xxxxxxxxxxx >>>> www.rebphoto.smugmug.com >>>> Feed a Cat... >>>> Starve a Fever........ >>>> >>>> >>>> >>>> ----- Original Message ----- >>>> From: Lea Murphy >>>> To: List for Photo/Imaging Educators - Professionals - >>> Students >>>> Sent: Wednesday, January 28, 2009 12:38 PM >>>> Subject: good lens gone bad? >>>> >>>> I have a dedicated 5D and lens in my studio. It never >>> leaves there and isn't used by anyone else. >>>> Today when I used the camera for a session it was >>> acting all funky, had a heck of a time making focus and was >>> kind of grinding around as if I were manually focusing with >>> the lens set in autofocus mode. I removed the lens, put it >>> on my 5DM2, it behaved the same way and the camera gave me >>> an error saying the contacts needed cleaning. I cleaned them >>> but the problem persists. Can a lens or lens contacts go >>> bad? It hasn't been dropped or used outside the studio >>> ever. Actually, it's never off the studio body. Any >>> ideas what in the world is going on here? Lea >>>> >>>> babies. they're what i do. >>>> www.leamurphy.com >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> babies. they're what i do. >>> www.leamurphy.com >> >> >> >> > > >babies. they're what i do. >www.leamurphy.com > > > > > > > Foto/SFX, San Jose, CA 408-835-1184 http://www.aviationphotographers.org/, http://www.fencecheck.com http://www.myspace.com/fotosfx, http://www.portfolios.com/profile.ht...=14627.baldwin
