Question about Quantaray Tech-10 70-300mm f/4.0-5.6 for Canon EOS
I have a Canon XTI and a Quantaray 70-300mm lens. When ever I try to use the lens, I get an error 99 message (turn power switch to off then on again or re-install battery). I spoke with a camera guy at my local Hunt Photo, who suggested cleaning the contacts on the lens with a pencil eraser. I tried it. It did not work. HELP!!!
I posted a problem, and have found a partial solution, at least if you get the error while shooting. After cycling power to clear the error, try lowering your ISO setting - it may need to be lowered a bunch, so keep trying. Mine cleared up when I went from ISO-800 to ISO-200. My testing is limited, so this may be only a partial fix.
Speculation (based on working with electronic sensor arrays): I believe the camera is indeed trying to protect the sensor. ISO basically sets the sensitivity of the sensor to light. The camera probably calculates the expected sensor signal before each shot, regardless of mode. Sensor signal is a function of ISO (sensitivity), shutter speed (integration time), aperture, and light input. It has influence over shutter and aperture, but none over ISO. It likely gets to a point where it can't solve the equation, so shuts down and gives an error, as user-error is not the only reason it could fail to solve the equation. Going to M would likely exacerbate the problem. I hope this helps.
Posted on Sep 06, 2008
I have a similar problem. The contacts seem temperamental for the XSI on this lens. But strangely, I've found as long as you aren't focusing in on a bright image, it works just fine. The only thing I can figure is with a 300mm magnification is that it doesn't want to burn out the chip so it's a built-in protection of some sorts. Try cleaning both the contacts on the lens and the camera body gently. Does the problem happen as soon as you turn on the camera, or mid shot?
Posted on Jul 07, 2008
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Posted on Jan 02, 2017
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