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.
An expert who has achieved level 2 by getting 100 points
An expert that got 10 achievements.
An expert that got 5 achievements.
Visited the website for 3 consecutive days.
Re: I'm using Tokina 12-24mm f4 on my Canon EOS 20D.
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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
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.
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
If this solutions solves you problem, please do not forget to rate my solution.
If not, then please comment back so I can help some more
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.
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.
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!