Question about Tokina 12-24mm /f4.0 for Canon

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I'm using Tokina 12-24mm f4 on my Canon EOS 20D.

Hi, I'm using Tokina 12-24mm f4 on my Canon EOS 20D. The diaphragm/aperture blades appear to have stuck at about f/8. Can't take pictures, camera either displays 'Err 99' or takes pictures at wrong aperture/exposure.

The viewefinder is dark as the aperture remains small at all times. Camera works Ok with other lenses. I've tried removing batteries, resetting the camera - to no avail.

Thanks

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  • 73 Answers

Most likely something bad has happened. It out of warranty, usually its 5 years. This is a pro job, getting to anything inside a lens is a very special job. There are a number of places to send it out. Check http://www.acecam.com/srindex.html and write to one or two of the places for estimates. It could be $150 or more plus shipping and taxes. A new one is about $400+, you could check around the many on-line camera stores for a used one. Could be a simple electronic part or the iris blades are bad.

Posted on Jul 27, 2009

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1 Answer

Canon eos 20d error 99


1.Remove the battery, lens and CF card. Allow the camera to sit without power for 20 minutes and then reinsert a fully charged battery.
2.Turn the camera on and push the shutter button as if you were taking a picture.
3. If you don't get the error message reattach the lens and insert the CF card.
4. Check the below canon eos 20d service manual link:
http://goo.gl/YtVLQR

it will help you to save a lot of money
Hope it helps, Thanks

Aug 07, 2011 | Canon EOS-20D Digital Camera

1 Answer

I have a Canon EOS T2 film camera. The shutter blades appear to be stuck half-open. I have checked with two lenses, it's not the lens. Have replaced the battery, no change. Any suggestions?


It's possible that the gold contacts between the camera and lens are dirty and not making an electrical contact. The DIY fix is to take a pencil eraser and gently polish these contact surfaces both the camera and lens contacts. They look clean but over time accumulate a hazy oxide that prevents proper communication between the camera and body. Also the blades will not move if you have the lens off (no power) the camera as it will be set to the last known aperture. The lens needs to be on the camera to work and operate the aperture.

May 17, 2011 | Canon EOS Rebel T2 with 28-90 lens 35mm...

1 Answer

Hello, I mounted 12-24 mm f4 Tokina lens on my canon 7D, but when I change the aperture from F4 to anything else, I get this error message"camera cannot communicate with the lens, clean lens...


Did you clean the lens contacts with a pencil eraser or with something else? If memory serves F4 is wide open on this lens, right?

Feb 15, 2011 | Cameras

1 Answer

Item: Canon EF-S 17-85mm 1:4-5.6 IS USM Camera: Canon 20D Problem: At a focal length of below 35mm with the aperture set smaller than f4.0 in any programme mode an Err 99 appears in the view finder,and...


Check this article which will lead you through diagnosing the problem and a possible fix.

http://www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

Sep 20, 2010 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

1 Answer

How do i cahange the f-stop on a eos 20d?


the F-Stop usually refers to changing the light entering the lens by a factor of 2. Therefore you can use the aperture or the speed to do that For example changing the aperture value from F5.6 to F8 is 1 stop 1/125 to 1/250th of a second is 1-stop
On the EOS 20D - turn the control knob to M - Manual - and there you have full control over both speed and aperture and can change the exposure anyway you like
if you could add some ocntext as to why you want to change the F-Stop I may be able to help further
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Mar 25, 2010 | Canon Photography

1 Answer

I have a canon eos 20D and the camera don`t accept 2, 4, 8 GB CF i download the last actualization and the problam is the same can you help me with this problam thanks


I have a Canon 20D in my fleet and have used 1 gig card in it almost exclusively however I did use a 2gig and a 4gig when shooting RAW + jpg. I would think that you haven't formatted the card for the camera even if it's a new card and has never been used you need to format the card to the camera you are going to use it in.

Jul 09, 2009 | Canon EOS-20D Body only Digital Camera

1 Answer

Grainy, Spot Filled Images when using Manual Modes Only


It sounds like the aperture is getting set very high. If the aperture is a high number, the lens opening is very small which lets less light in and would cause a dark image. This would also show any dust that is in or on the lens or image sensor. The dust doesn't usually show on apertures with a larger opening (smaller number). Make sure your aperture is being set to a reasonable number, probably no higher than 8 or so.

Oct 29, 2008 | Canon EOS-20D Body only Digital Camera

2 Answers

Canon EOS 20D Digital zoom failed


Hi there,
The autofocus mechanism on some lenses can be damaged if you manually focus while the camera is attempting to autofocus. Basically, you would be working against the motor and gears. 
There is no need to download software before using the camera, however, I would suggest going to Canon's website and downloading the firmware upgrades for it. Here's the link:
Canon 20D Firmware Download
Hope this helps!

Oct 12, 2008 | Canon EOS 20Da Digital Camera

1 Answer

My Canon EOS 20D has a problem


could be that you have dust / dirt on the sensor even when mine was brand new it had dirt on it.

Jan 27, 2008 | Canon EOS 20Da Digital Camera

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