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Re: sticky shutter, how do i get it cleaned ?
Not unless you are confident that you can. Cleaning the shutter involves stripping the lens down to get at the shutter mechanism. I have posted some tips for this and also have photo's of an f470 disassembled. Please do not think that it is a simple job to perform
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Take your camera to a Canon authorized service center and see if they can try to clean the button area. This might solve your issue. Other than a cleaning they will most likely have to replace the button assembly and/or top cover depending on how the camera is designed.
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The lens dust cover (sometimes called the shutter) can stick sometimes due to residue or sticky substances. Sometimes it can be tweaked with an alcohol swab gently rubbing the dust cover to lubricate it to clean off the residue.
If the shutter isn't closing it could be annoying or expensive. The dust may be enough to jam the little motor or mechanism that close and opens the shutter. If you are lucky all that needs to be done is to clean out the track with a qtip(cotton swab) or a very small brush or both. If the mechanism is damaged or the cleaning does not help them the repair cost will be more than a new camera. Unfortunately repair parts for cameras are very expensive. If you have a camera shop they should be able to look at it and tell you if a cleaning will help or what your other options are.
Does this fault happen only with that lens? Also, you're wrong about the shutter: it appears you're mistaking the shutter assembly for the lens diaphragm (also known as the "iris").
Older lenses often have sticky diaphragms, usually due to oil migrating onto the individual blades and sticking them together. A sticking diaphragm can interfere with the shutter operation on some SLR's.
Fixing a sticky iris is usually a professional job, but if you're careful then with a simple non-autofocus lens like yours it's often possible to do on a DIY basis but will be very fiddly. The object is to get to the iris blades and to then thoroughly clean them. They're Teflon coated so should slide over each other without lubrication, but their pivots normally need the tiniest bit of lubrication. If you try and fail then you've lost nothing as the lens was effectively scrap anyway and there are plenty of cheap/free replacements around.
Firstly, to isolate the shutter as the problem, turn the camera on and the flash off. put the lens into full optical (not digital) zoom. Then turn the camera lens to face you and look at the lens and take a picture.
With the camera in full optical zoom the shutter assembly will be right up to the outer lens so you can see it clearly. When the button is pressed you should see the shutter fire across the lens inside. It should cover the lens completely. If it does not or doesn't fire at all then you get over exposed pictures or lines across the photo. The most likely cause for this is moisture residue on the shutter leafs sticking them together.
To clean you will need to strip the lens down almost completely to access the shutter assembly. If this model of camera uses a sealed shutter unit then it will be impossible to clean. The only models i have found so far that use a sealed unit are the F460 and F470. Yours I am not sure of as I haven't opened 1 up but the solution for most is to strip it down and clean.
Tip: use another camera to photograph each stage to help on re assembly
I had posted a solution to "lines on photo's or over exposed photo's" on my tips page covering most digital cameras but just recently I noticed my whole page has been removed and I am waiting to hear why.
Basically, lines on photo's or over exposed pictures in daylight are due to the shutter not closing over the lens completely.
It is a mechanical fault due to dirt/ grease or moisture on the shutter leafs sticking them together.
Error 39,12.40 is caused by the black shutter that moves across the face of the lamp inside the document feeder getting stuck. I've repaired over a dozen of these units and all had the same problem. The shutter is moved by 2 coils of mylar fastened to a rotating shaft, as the shaft rotates the mylar coils unwind pushing the shutter forwards. Xerox have fastened the mylar to the shutter with 2 small pieces of sticky tape, these come of and the left over adhesive sticks the shutter to the housing assembly. To repair this the scanner assy has to be removed from the ADF unit, the cover over the scanner slot removed and then the mylar coils cleaned with alcohol or label remover. Don't forget to clean the housing where the mylar was sticking and don't replace the sticky tape, the shutter is fastened well enough without it.
Nothing to do with any chips being faulty.
The clue is in the video....
The video function does not use the shutter.
The shutter has become fouled.
Unfortunately this is a major strip down to clean the shutter