Diaphragm Peavey
When Will That Canon EFS 17-85mm Lens Aperture Diaphragm Start to Break?
Have you heard about the Canon EF-S 17-85mm IS USM lens aperture diaphragm breaking? This is a great lens that may be used so many scenarios its tough to be without it! What do you do when it starts to fail?
A new Canon EF-S 17-85mm lens probably lasts in the region of 4-5 years, so you will be ready to take countless thousands stills with it, and will discover it is a great general-purpose zoom lens. Some photographers buy a Canon EF 24-70mm lens to replace it, but keep the 17-85mm for a backup.
Recently while on a photography road-trip we were using the 17-85mm lens on a Canon 350D camera. Targeting was fine, but any effort to take a photograph would end in the 350D showing "Err ninety nine" on the LCD, and the camera needed to be turned off and back on to clear the error. "Err 99" is a generic catch-all boo boo code on the 350D, and can mean most anything.
Trying the 17-85mm lens on a Canon 50D ended in a explicit boo boo : "Err 01 - Communications between the camera and lens is flawed. Clean the lens contacts." Unsurprisingly, cleaning the lens contacts with a pencil eraser failed to do anything to decide the blunder.
Some further research on the web indicated a potential issue with the diaphragm assembly ; the moving parts that set the aperture. Trial and error indicated the diaphragm assembly was failing when the zoom was between 17mm and 24mm and the aperture was smaller than f / 4. Outside of these parameters, the lens still functioned typically.
The "Depth-of-field Preview" button on Canon DSLR cameras stops the lens down to the now selected aperture. It proved to be a handy way to check the lens, and it may be confirmed the lens diaphragm assembly was working properly at the longer zoom range, but failing to operate at all between 17mm and 24mm.
When hitting the DOF Preview button, you ought to be ready to hear the diaphragm assembly working if the aperture is stopped down from the lens ' maximum, as well as seeing the lens aperture blades closing when looking into the front of the lens.
Allegedly this is a fairly common issue with the 17-85mm lens, generally due to an open circuit in the ribbon flex cable to the diaphragm assembly in the lens, caused by repeated zoom operation of the lens.
Replacement cables are available to fix the Canon EF-S 17-85mm diaphragm flex wire online so that you can fix the lens yourself if you have got the perseverance and time. The 17-85mm lens is out of warranty, and based primarily on a fast search on the web, is perhaps worth about $300 if it was fully functional. It's a great lens, and was still gets lots of use, so it is worthwhile to get it working again.
You could be worried about shipping the lens to a shop, that it'll be an expensive exercise and may not be worthwhile given the value of the lens. You might want to considering buying a Canon EF-S 17-85mm lens flex cable online, and attempting the replacement yourself as an alternative. If you're pretty skilled with tools and a soldering iron, repairing a lens could be right up your alley. If the diagnosis of a defective diaphragm ribbon cable is wrong, then swapping out the cable won't accomplish much, aside from learning about how the lens works.
Should it be shipped to a camera center, and hope it is not going to be too pricey to do, or should the consumer find a Canon EF-S 17-85mm aperture repair part themselves? Its a tough question to answer as it is not a simple fix but if you can do it you will save tons of bucks in the act.
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