Question about Tamron Zoom Telephoto AF 70-300mm f/4.0-5.6 LD Macro Autofocus Lens for Canon EOS

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AF 70-300 causes error 99 in my Canon 300D

I have been using my Tamron 70-300 lens with my Canon 300D for a little less than a year. A few days ago I started getting an error 99 in my Canon 300D when using the Tamron lens only. I have discovered that the problem only occurs when using the Tamron lens and not with other lenses I have. The lens only works without giving error if I use it in the maximum apperture. Once I use a smaller apperture (smaller than 5.6) I get the error 99. Also in a copuple of instances I have noticed that when focusing there is some noise in the motor as it reaches its maximum distance as if the motor was pushing beyond the limit.

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Re: AF 70-300 causes error 99 in my Canon 300D

This is usually a torn flexible circuit or binding aperture in the lens. It'll have to go to a repair shop for replacement. About a $80 job.

Posted on Dec 06, 2006

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Re: AF 70-300 causes error 99 in my Canon 300D

I am facing the same problem. The only way to avoid it is to use it at the maximum aperture between 180-300, thats 5.6.

Posted on Mar 17, 2009

Re: AF 70-300 causes error 99 in my Canon 300D

I have the same thing. When you press the aperture control button (only available on Canon) the diaphragm gets stuck and disconnecting the lens from the camera is necessary.
However, using the lens in the range 70-180mm works fine, also when stopped down. Using the 180-300 range with stopping down produces err 99.

My solutions:
- use the broken Tammy in the range 70-180. Avoid the 300 mm.
- buy a new Tamron 70-300. Having the old lens repaired is not worth trying...
- buy something more solid, like a Canon 70-200 L. Although the Tammy feels ok, its internals are not really built for the road.

Posted on Jun 28, 2008

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Re: AF 70-300 causes error 99 in my Canon 300D

I have a Tamron Lens 17mm to 35mm and need an aperture flex to enable it to be repaired, where can I obtain this flex please can you help. Thanks

Posted on Nov 25, 2008

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Error 99 with a Canon 300D (original rebel) and Tamron XR Di II 18 to 200 mm lens. Occurs when lens is zoomed out. Does not happen with other lenses (Canon 18-55 kit, Canon 75-300). Cleaning contacts on...

Welcome to Fixya
Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts....

Here's what you can try:
Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad. Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon.

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I have a tamron 70-300mm i had a canon 1000d and the lens worked pefectly fine with it but nw i hav purchased canon 550d and when i conect my tamron lens with it , it shows an error 01 please assist me

This is the kind of error which you always risk these days in buying lenses which are not from your camera manufacturer. Error 01 simply means that the camera cannot communicate with the lens. Canon's protocols are not open standards and third party manufacturers have to reverse engineer to produce something which works. As they're working in the dark, they cannot always arrive at a solution which makes all models suit all Canon bodies.

You have two possible solutions:-

Visually inspect the contacts on the lens and the camera body and if they're anything other than clean and bright then use a clean pencil eraser on them. Be very, very, careful not to let any of the rubber crumbs into the lens or the camera body.

If that fails, visit the Tamron website to see whether the lens can be returned to be updated for other bodies. if it can't then sell it and buy a later Tamron model or better still a Canon one. They may cost more, but the results are better and their resale value is much higher.

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First remove the lens, battery and card and leave the camera like that for about 30 min. After that, insert a fully charged battery and switch on the camera. If the error still shows up, it is a fault with the camera and has to be serviced.
If not, turn the camera off and insert the card. Format the card in the camera and depress the shutter button. If it shows an error, the card is faulty.

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Please rate my help++++Thanks for using FIXYA

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I have faced similar problems previously with my Canon 20d and Sigma 170-500. Its even more annoying to see it happen in field while it would be okay back home. I was told that it is electronic compatibility problem instead of complaining the best was to change the lens and hence bought a 100-400 and happy ending.

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try cleaning the lens contacts of your lens and camera.

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