20 Most Recent Quantaray 100-300mm F4.5-6.7 Zoom Lens for Canon AF Questions & Answers

If it doesn't work then sorry that is how it is. I heard is not really a good reason, I hear a lot of things most is not true.

Quantaray... | Answered on May 19, 2017

Reduce the exposure time.

Quantaray... | Answered on Jul 06, 2015

Wow, I'm surprised to actually tells you to clean the contacts? What model Canon Rebel do you have? Okay for cleaning the contacts simplest and most effective way is with a good clean new red rubber pencil eraser. Make sure the camera is off and remove the lens, place the camera body face down on a clean lint free surface or install a body cap if you have one. Hold the lens as vertical as possible but tilted slightly to be able to see and work with the gold contacts. Lightly rub the contact surface with the eraser, it won't look as if you have done much but it does shine them up well. When you have finished cleaning them use a lens cloth (not a tissue) to lightly clean any rubber dust from around the contacts and the rest of the mount. There shouldn't be much if any you are polishing the surface not erasing. Set the lens aside and while holding the camera as much as possible lens side down take the eraser and gently clean the contacts again it doesn't take much don't forget you are polishing not erasing, a few passes should be all it takes. Once done again use the lens cloth not a tissue and clean the area of any dust that may have occurred. Assemble the lens and camera and turn it on.

On another note but a related subject. How new is your Rebel compared to the Quantaray lens? If the lens is newer then the camera that's fine but if the camera is newer then the lens this also may be part of the problem.

Quantaray... | Answered on Jan 19, 2011

You need to by one with a Canon EF fitting.

Quantaray... | Answered on Dec 04, 2010

Check that the contacts on the lens are bright and clean. If they are then you have a faulty lens which must be sent away for repair.

If it's under warranty then it will be free, if not then there may be a fixed price repair policy and you'll need to compare the fee charged to the cost of a new or used replacement lens.

Quantaray... | Answered on Sep 11, 2010

The older lenses will work with the Canon digital cameras, but they will be manual focus and you will need an adapter. The adapters are available at camera shops like B&H. I use some older lenses for macro.

Quantaray... | Answered on Aug 16, 2010

It is lens fungus and you're correct in your assumption that it's uneconomical to professionally repair on your lenses. But it need to be pretty bad before it affects image quality so don't junk them just yet.

Some types of lens fungus can be killed simply by leaving the lens out in sunlight, but I'd suggest that it's better to leave them exposed to the indirect sunlight on a bright overcast day to prevent any chance of sharply focussed light burning the inside of the lens. Killing the fungus won't remove the dead stuff but it prevents the problem getting worse.

Quantaray... | Answered on May 29, 2010

You may have two options.
First, contact the place where you bought the lens from. Quantaray is mainly a Ritz Cameras brand.
Secondly, you can use third party repair shops.
I purchase some of my lenses from KEH. [keh.com]. They have a repair shop for cameras and lenses.
Attached is their FAQ site. http://www.keh.com/repair-center.aspx

Hope this helps.

Quantaray... | Answered on Apr 08, 2010

Like all Quantaray lenses, this lens is a very cheaply built model and so lacks the refinements, build quality and optical capabilities of better lenses. As a result, it does not have a macro mode so is not designed to focus on nearby objects.

That just leaves it as a 100-300mm telephoto zoom lens. The 100mm end may be suited to head and shoulder portrait shots (if it can focus close enough), the 300mm end is a long telephoto for subjects such as architectural close-ups and best used on a tripod or monopod to avoid unsharpness caused by camera shake. Usually a 300mm would be suited to wildlife shots, but the very slow f6.7 maximum aperture at this end really limits this function to non-moving objects simply due to the longer shutter speeds required to compensate. You could turn up the ISO sensitivity, but then you get noisy images...You may find that the maximum aperture at around 200mm is around f5.6, this is still quite poor but far more useful and as long as the light levels allow a 1/200th or faster shutter speed it should also be possible to hand hold the lens without worrying about camera shake. If your camera has seven megapixels or more, then shooting at 200mm and then cropping the shot afterwards to achieve the same view as a 300mm will probably give better results.

Your lens has it's limitations, but a good photographer will learn to work around them when necessary and to embrace them as needed. The 100-300 is known to be a very poor optical performer, but for portrait work a soft lens can be used to good effect. At the end of the day, it's a US$100 lens so you can't expect that much from it but you as the photographer can make a lot of difference by using it creatively.

I hope that I've helped, if so please take a moment to rate my answer.

Quantaray... | Answered on Feb 14, 2010

With right adapters it should fit in any camera. At least Canon, Nikon, Minolta, Pentax. The adapters are 10-20$ each and easy to fit in the lense.

Quantaray... | Answered on Nov 04, 2009

I have been researching this problem and found there's nothing you can really do. Appararently, the quantaray, being an older lens, wasn't made to work with this latest era of cameras. Though it might work perfectly with your older camera, its technology is outdated as it relates to digital cameras1.gif and can't mesh with the latest and greatest. By the way, most of my questions were answered on the Digital Camera1.gif Resource page (www.dcresource.com

Quantaray... | Answered on Jul 16, 2009


You need to clean the contacts with a dry cloth an alcohol swap etc. of the lens and body. Also try to do firmware update.

Please do accept the solution and revert for further assistance.


Quantaray... | Answered on Jul 09, 2009

Canon EOS Digital Rebel XT or XTi are both really really great cameras.

Quantaray... | Answered on Mar 13, 2009

You can use a Quantaray lens that fits on a Canon EOS film camera body on any Canon EOS camera body - film or digital. Your choice of EOS camera depends on your budget and your needs.

I recommend starting out with a used or refurbished model - let someone else eat the depreciation on the camera. After you have shot with a digital SLR for a while you will have a much better idea what features matter most for your needs and can make a better decision what new(er) model is the best fit for your money. Obviously you know a bit about photography having used a film EOS camera but there are many things that are different about a digital body. One of the biggest differences is that they come out with a new camera several times a year, and a camera body that is just 2-3 years old will be 2-3 generations old, and worth only a small fraction of the price it sold for new - unlike film bodies that held their value much longer.

Quantaray... | Answered on Dec 14, 2008

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