Question about Quantaray Tech-10 70-300mm f/4.0-5.6 for Canon EOS

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I get an error 99 message (turn power switch to off then on again or re-install battery)

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!!!

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  • bryfoutz May 08, 2008

    I am having the same problem, but my camera is the XSI. They told me to use rubbing alcohol, and it didn't fix the problem either. I called Canon and they said that lens isn't supported by Canon.

  • devis0306 Jul 12, 2008

    hi i have the same prob on my canon xti/400 d, using a 70-300 f 4.6, which i have had for 2 years. however this prob is only recent and didnt have a problem in the first year.

  • wdwerries Sep 06, 2008

    I get Error99 with Quantaray 70-300 on Rebel Xti. Seems to be image dependent. An obsessive engineer, I wanted to learn the limits of the camera. All worked well until I shot a palm frond in a clear sky - 1st error 99. Error consistent with that shot, but not seen in others. Tried all FAQ fixes, but none worked.

    Went to ballgame in indoor stadium. 1st ~20 shots with lens were ok. Then sporadic Error99 for low-light extreme closeups. Slowly built to sporadic good shots under most conditions. FAQ fixes had no effect. Randomly changing metering mode worked for several more shots - almost like the processor built a metering profile, and then exceeded some limit.

    At home under direct light (and full 24hrs later), photo'ed small piece of gray shale, and small piece of granite - beige with black flecks. Alternated shots in random order. Camera would NOT shoot the granite (Error99), and would always shoot the shale perfectly.

    Canon lens has never given ANY error.

    Canon has a problem they are not owning up to (or are trying to squelch 3rd party lenses). Any way to get Quantaray directly involved? Its in their business interest.



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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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