Aperture stuck on quantaray 28-200mm for canon AF (rebel)
The aperture is not physically responding on my lens. The f-stop number changes on the LCD readout, but the aperture remains stopped all the way down to 22. Just wondering if anyone has any advice on the problem before I open the lens up to check the mechanism, as this is the only "auto-focus" camera I've ever tried to repair and don't really know what I'm getting in to. Thanks!
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Re: aperture stuck on quantaray 28-200mm for canon AF...
Does the lens have an aperture ring? If so, some such lenses also has a 'lock' (a tiny button near the narrowest aperture) enabling it to be used with cameras having CPU contacts. Check if your lens has this.
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Is the lens just bought new? If not, it likely is 'chipped' for the Canon AF film cameras. I do not recall if Quantaray rechips their lenses. I believe Sigma does theirs, but not sure about Q~. If you got the paperwork with the lens, contact a repair center or Quantaray. Contact US1 Photo at 877-300-8070. they are a Quantaray dealer. Ask for the number to the distributor, warranty repair facility and for the number of the quantaray home office. One of them should help you get the right lens.
The Long answer is maybe. You'd have to call some stores that carry the Quantaray products. Get phone numbers for the distributor, warranty repair shops, and maybe Quantaray home offices which may be in another country. Then you can find out if they still have the mounts for those lenses in stock, can it be done, where to send it, and how much. Mind you, they may have to totally change the electronics and the motors inside the lens too.
I bet they are not AF lenses. There are adapters that add the AF contacts to "fool" the camera but increase the zoom. You can get used lenses from many "on line" camera stores with warranties for a few months.
If I read this right, your lens is a 28 to 200mm zoom lens with aperture of f:3.5 - f:5.6. What this means is that at 28mm it has a maximum aperture of f:3.5. When you zoom out to 200mm, the maximum aperture is now f:5.6. This is perfectly normal for a zoom lens of this type.
Typical situation in Shutter preferred mode. I have the shutter set at 1/125 of a second and the f:stop is f:3.5. When I zoom out to 200mm, the shutter speed is still 1/125 of a second, but the f:stop is now f:5.6 and I have decreased exposure (darkened the picture) by almost 2 full f: stops.
Realizing this, I think that "turning off the camera" really isn't a fix. The problem is realizing that the aperture will change as the focal length of the lens changes (as you ZOOM in or out on your subject). Try the aperture preferred mode and you should note that the shutter speed will change as you zoom in and out.
Most important, pay attention to shutter and f:stop info in your viewfinder. FYI : Zoom lenses that hold aperture at all ranges cost several thousand dollars, and canon makes them - they weigh a ton.
Make sure your F stop number is not set to a high number.
like 22 unless you change the f stop in the camera. what im telling you to make sure of is that the aperture of the lens is not set to its smallest opening. because that would make the eye piece look dark inside. to fix you would just turn the ring with the numbers going from 3.8 - 22 or something close to a lower number like the 3.8.
let me know if that fixes it,