Question about Quantaray 28-200mm f/3.8-5.6 for Canon AF

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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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  • suhargett Mar 10, 2009

    Quantaray 70-300mm, but same problem with the aperature stuck almost completely shut. Checked but no lock button.

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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.

Posted on Feb 10, 2009

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Hard to say without more info.

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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,
Caleb

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