20 Most Recent Quantaray 28-90mm F3.5-5.6 Autofocus Zoom Lens for Minolta Questions & Answers

Contact Sigma, That's who made the lens for Quantaray,

Turn the aperture ring on the lens to its smallest setting (largest f/number). You can control the aperture from the camera body, the same was as with a lens without an aperture ring.

Fitting is not always the solution. It is the software which recognises the hardware attachements. Either upgrade your camera software or use only the manufacturer recommended add ons. [email protected]

Hard to say without more info.

Is the lens just bought new? If not, it likely is 'chipped' for the Canon AF film cameras. I do not recall if Quantaray rechips their lenses. I believe Sigma does theirs, but not sure about Q~. If you got the paperwork with the lens, contact a repair center or Quantaray.
Contact US1 Photo at 877-300-8070. they are a Quantaray dealer. Ask for the number to the distributor, warranty repair facility and for the number of the quantaray home office. One of them should help you get the right lens.

lightspiritphotography.com

The Nikon D40 requires the use of AF-S/AF-I lenses. Here is a chart of lens compatibility for Nikon SLRs:

Nikonian.org

Hey Quiltzlady,
If you were an authorized service technician you could probably order this part from the manufacturer, and if this camera is really only $90 to purchase new it is very likely the cost of the repair would not be worth doing. The suggestion to super glue the ring back together might work but I would try epoxy being that it is a lot stronger, but remember you run the risk of rendering the lens inoperable when you involve glue with something that relies on moving parts to operate properly. Another suggestion is to find the same lens, but broken, for sale that this ring is not broken on, and use that lens as a parts lens I hope this helps.

Sincerely,
Allan
Go Ahead. Use Us.

That info can be found right here on Fixya

Fixya does not provide sales services.

Return to vendor for repair or replacement

Any particular tune ?

Time for a CLA. The focus mechanism will is usually filled with grease, makes it smooth turning, if that grease separates it can make things difficult. Also, it could be something is misaligned with the helicoid. Here is a YouTube video that will explain how they work: https://www.youtube.com/watch?v=n_Lji91nIos

You need to contact local dealer , Or if you have the Box, contact who made it. Or see if Manual can be downloaded from Product Web Site

Hi Nicolas. Normally, this problem comes from a loose screw and roller that makes the mechanism gets stucked.

Sorry, you have not said where your country of origin nor which lens needs repair, thus we cannot make any suggestions. There are numerous repair shops around the world. Doing a Google/Bing/Yahoo search will provide you repair shops; one may be close to you. Also, depending on the lens you may be better of replacing it with a more updated better quality one; just a thought.

I'm not sure why you want to know this. It is a lens fitted for a Pentax camera. Nikon does not make a 20-90 mm Macro lens. Then it has a aperture from 3,5 to 5,6. It never would work on a Nikon, unless you have an adapter and then it still only could be used in manual mode. You have to do all settings, manual. not only the focus, but also the aperture, shutter time and ISO settings. I use a Nikor 24-85 mm f 1:2,8-4 D Macro, 1:2. With this lens when in focus the object is only half the size of the original. I think it comes close to the 28-90, but it is at least 5 times as expensive. When you are really in for macro photography, you better choose a prime macro, like the 40 or 60 mm from Nikon. both are 2,8 and not as expensive as the zoom version. The results will be much sharper. When you are talking of equivalent, I don't know what part should be equivalent, because that is important to know. As long as the focal length is the same and the aperture, you can make the same perspective pictures on the same distance. Only when you buy a DX, or even e lans for a four thirds camera, still the focal length will be the same, but as soon as you put these lenses on a camera with a larger sensor you will get massive vignetting. A lens made for a full frame (35mm) camera, when used on a DX or four thirds camera, will give the same perspective and will give no vignetting on a camera with a smaller sensor.