Question about Tamron 70-300mm f/4-5.6 Di Zoom Lens for Canon AF Cameras

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Problem with lens

Hi,
I need some help with my lens which is the Auto Focal doesn't want communication or means doesn't want to open eventhough I set an aperture 5f/.6 but still doesn't work, but it's work if I switched to the manual.

thinking about buy other lens but I can't afford it, I love this lens, I bought on December last year.

What should I do, thinking about buy other same lens but I can't afford it.

Thanks,
Lina

Posted by on

  • Lina0210 May 29, 2008

    Hi,

    Thanks for all suggested, I went to the expert and brought the lens to him, he said, the aparture & the autofocus (AF) have collaps it's exactly same like my teacher told me, if I want repair it, it cost me fortune, so I bought a new one (same product/item) coz I love it so much.



    Thanks guys



    Lina







  • Anonymous Oct 05, 2008

    The diaghram will not open automaticlly, nor manually. My second lens works fine.

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  • 23 Answers

If you cant afford it read this,
The reason for this is that I find it easiest to track a moving subject if it's in the middle of the viewfinder. Cameras cannot know what you want to focus on, and if you start using multiple AF points, how is the camera supposed to know that you want to focus on the bird and not the tree - cameras are lacking in human thought processes! What is quite handy though is using the AI SERVO FOCUS or AI FOCUS settings so that the lens will alter it's focus on the subject over which the centre AF point is aligned as it moves towards you or further away from you. Without this, the focus will fix at the point you half depress shutter and if the subject comes closer or goes further away then it will be out of focus. you can call any expert of lences also for it if you can afford.

Posted on May 25, 2008

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Posted on Jan 02, 2017

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Focus out problem in canon 50d while using 24-70mm lens?


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You can minimize the unwanted effects by staying away from both the extreme wide angle and zoom focal lengths as well as the widest aperture settings. If you can stay 2 or 3 stops smaller from wide open, you can limit these destractions from your pictures. This is recommended advice for nearly every lens: Keep away from the extremes.

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You have not supplied enough information, however with the Sigma lenses here are a few things that could be a problem.

Is the switch from auto to manual focus set to auto focus.

Is the lens the proper mount for the camera it is installed on (meaning have you used an adapter to go from a Nikon to a Canon mount?) if so then there will be no electronic communication and the lens will only function in manual focus mode.

Is the lens compatible with the camera model? (meaning some newer cameras set the lens aperture in the camera while some older lenses set the aperture on the lens.)

Part 1 of 2 Have you installed an older "film" lens on a newer version digital camera?

Part 2 of 2 Have you installed a digital full frame lens on a Canon "S" mount with the APS size sensor with the 1.6 focal factor?

Have you changed the camera model to a newer Canon EOS

Have you updated the camera firmware recently?

Have you lightly polished (cleaned) the contacts between the camera and lens?
Have you received an error code 99?
Cleaning the gold contacts on the lens and camera body can be done with a clean pencil eraser and lightly polish the matting surfaces making sure no dust gets into the back of the lens or the camera body. Hold the camera lens mount down while lightly polishing the contacts same with the lens. Do not wipe clean with a facial tissue or use any type of liquid cleaner.

Also third party lenses like Sigma often do not have the compatible electronic "chip" to properly communicate with all Canon EOS cameras. Meaning if you had the lens on a Canon EOS 20D and then put it on a Canon 50D chances are it won't work.

Is the lens properly locked onto the camera body dismount and remount the lens generally solves this problem.

If non of the above isn't the problem then a trip to a repair center is needed.

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