Question about Quantaray 100-300mm F4.5-6.7 Zoom lens for Minolta

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AF problem with Quantaray 2X adapter

My Sony A100 works fine with this lens until I put the focal length doubler on it then will only work with the lens fully retracted.

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Re: AF problem with Quantaray 2X adapter

I believe a tele will not work with auto focus when the lens is f4 or larger at the smallest end.

Posted on Jun 24, 2008

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Re: AF problem with Quantaray 2X adapter

How does it stop working? Do you mean it doesn't auto focus anymore?
Many longer focal length lenses wont auto focus with 2x teleconverters on them.

Posted on Dec 07, 2007

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What is T Mount Telephoto Zoom Lens with 2x Teleconverter

The T-mount is a universal thread developed by Tamron which allows various adapters to couple a lens to a wide variety of camera brands. If a lens is listed as having a T-mount, it means that the lens can be coupled to your camera if you have a T-mount adapter for your camera.

A 2X teleconverter (often called a doubler) enables a lens of a specific to be doubled. For example, the lens referenced above actually is a 650-1300 lens but with the 2X teleconverter the focal length can be doubled to a maximum focal length of 2600.

I have an Opteka 600-1200 telephoto lens which I consider to be a decent lens for its very low price. I also have a doubler which came with my camera kit. That means I can increase the focal length of my lens to 2400 but I cannot imagine any reason to do so. At it's full zoom 1200mm focal length, this lens is very difficult to handle and must be used on a tripod with a remote shutter release.

It is extremely time consuming to focus and must be focused very accurately because it has almost no depth of field. At 1200 mm, the slightest breeze or vibration will cause the picture to go fuzzy from movement.

The lens is also large and does not fit conveniently in a camera bag so it rarely goes with me unless I know for sure that I will need it. It is not particularly good for sports action shots because the action will be over before you are ready to shoot the picture. With very bright light (such as the mid-day sun) and pre-planning and pre-focusing you might be able to get some interesting sports action shots. Say you're at an automobile race and you know a car will be coming into view at a certain spot, you can set up for that spot then trip the shutter when the car pops into view.

All that being said, I think this is a good lens to have in my bag without spending $10,000 plus for a really good lens of this size.

Feb 08, 2013 | Opteka 650-2600mm High Definition...

1 Answer

Can I use Quantaray AF 28-90mm f/3.5-5.6 in a NIKON D5100? Thanks.

Quantaray makes lenses with a variety of mounts for a variety of cameras. A lens with a Sony mount, for example, will not fit onto a Nikon camera. Assuming the lens has a Nikon mount, it will fit on the D5100. However, the D5100 requires the lens to have an autofocus motor. If the lens does not have such a motor then it will not autofocus. It will still work fine as a manual focus lens.

Jun 19, 2011 | Quantaray AF 28-90mm f/3.5-5.6 Lens for...

1 Answer

Will my Quantaray AF 70-300mm 1:4-5.6 LD TELE-MACRO(1:2) going to work with the Sony Alpha cameras? The A55 in particular?

Quantaray makes lenses with a variety of mounts. A lens with a Nikon mount, for example, will not fit onto a Sony A55. If the lens has the Sony mount then it will work fine with the A55.

May 03, 2011 | Quantaray Camera Lenses

1 Answer

Hi- purchased the Extender EF 2X II; it seems fine with my fixed focus 300mm, but the auto-focus doesn't operate with my 70-200mm EF IS USM zoom, in any mode. Any suggestions? Thanks G

You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).

Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."

Aug 01, 2010 | Canon Extender EF 2x II Lens Converter

1 Answer

Quantaray 70 - 300mm for Minolta AF (25-166-4546)

Check you manual, but it should be no problem- Sony bought Konica Minolta to have the Minolta lens mount (and engineers). Your old lens doesn't have all the internal electronics (and connections) of the new lenses, but every old minolta AF lens i've tried works fine with alpha

May 02, 2010 | Quantaray Tech-10 70-300mm f/4.0-5.6 Lens...

1 Answer

Can you tell me the Pros and Cons of using a Bower MC 2X N/AF. I am not an expert in using lens and Photography so Please make it simple.

A 2X adapter is an item attached between your lens and camera body. It's AF (which is good) and N (most likely a Nikon).
They make what ever zoom lens 2X the focal length. So a 135mm becomes a 270mm. So you get a bigger tele lens. They add extra glass, so the image is not as good without it, they eat up an F/stop. So outdoors in bright sunlight, no problem. It's shady and you have ASA 200 and you are going to have a slow shutter speed that can cause blur. Plus the viewfinder gets darker due to the extra glass. So in dim light, it may not AF and be hard to manual focus.

Jul 06, 2009 | Camera Lenses

2 Answers

Blurry pictuers

First of all, tele-multipliers or tele-converters do not have the greatest optics in the world, and are usually fine for close up images but not much else. Secondly, they do restrict the amount of light coming into the camera which could interfere with the internal metering. Third, you have additional lens surfaces to get dirty. To fix the problem, start with the easy one, and clean all lens surfaces meticulously with a soft lint free cloth. If that doesn't fix it, try shooting non-moving objects in brightly lit areas. If you are still getting blurry pictures, try using the tele-converter on a close-up image within the focal length of the lens combination. If that doesn't work, give the teleconverter to someone you don't like and go buy a good quality 50-135mm zoom lens. Vivitar, Sigma, or other similar lenses are good quality and are very reasonably priced.

Mar 02, 2009 | Digital Optics 52mm Camera/Video 2.0x...

1 Answer

Used on a Minolta Maxxum 800 si

The Minolta AF lens will fit and work on most of the Minolta AF bodies (it will depend on exactly what lens it is as to the compatibility), you will also find that it will fit and work with the new range of Sony
digital SLR camera bodies.

The Quantaray lenses are a little bit more difficult as Quantaray make lenses for several different types of camera body, it should mention on the lens what make the lens mount is for. If you post further information about the lenses it might help.

Sep 19, 2008 | Quantaray 100-300mm F4.5-6.7 Zoom lens for...

3 Answers

QUANTARAY FOR MINOLTA AF 70-300MM compatibility

Usually mounts are unique to a camera manufacturer. There are exceptions. Sony has the Alpha; lenses for the Konica-Minolta are the same mount. Your AF (autofocus) lens will work on it. You might also consider picking up a Konica Minolta 5D or 7D.....they're no longer made and hence are cheaply had.

The MD and Rokkor lenses won't work on the Sony Alpha.

Jan 19, 2008 | Quantaray 50mm f/2.8 AF Tech-10 for Canon...

2 Answers

Quantaray tech-10 24mm f2.8

Yes, I have this lens and it works just fine with Sony alpha A100

Dec 21, 2007 | Quantaray 50mm f/2.8 AF Tech-10 for Canon...

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