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.
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.
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