Top 20 Quantaray 28-90mm f/3.5-5.6 for Pentax Questions & Answers

I think you refer to one of the "wings" of the bayonet mount. If that, yo have to change the bayonet.

Since you already have a Quantaray lens, you should know that Quantaray makes lenses with a variety of mounts. A lens with a Pentax mount won't fit a Canon camera, for example. As long as you get the lens with a Canon mount it will fit the XTi just fine.

In order for the aperture to be controlled by the camera's program or primary and secondary control knobs, the lens must be set to the smallest opening - or highest number value f stop. The aperture must be operated by the ring if it is not left in the smallest opening position.

The FEE code you are seeing refers to a communication error between the lens and the camera body. Sometimes, simply removing the lens from the body and reseating it to the body will solve the problem. While the lens is off the body, carefully inspect the gold colored contacts on the lens and mating contacts on the camera body. Remove any dirt or debris found, being careful not to allow it to fall into the camera - or land on the back glass of the lens.

I found another explanation and possible remedy that stated:

"A flashing "FEE" is an improperly set aperture ring in 99.9% of all cases with this error message (i.e. user error). In very rare circumstances it can be caused by a damaged aperture ring (small lug broken from back edge) that can't "tell" the camera it is at the minimum position. If the aperture rings on the lens is set to minimum aperture (highest number) and locked there, but you still get a FEE error, it's possible that sloppy tolerances are causing the lens aperture ring to not move the little switch at the 8 o'clock position (on the D70 lens mount) as far as necessary to get a proper indication of minimum aperture. Try to see if the aperture ring (while locked) will move slightly when mounted on the camera to clear the FEE error.

Another remote possibility is that the little switch at the 8 o'clock position mentioned above is not functioning properly (sometimes they get dirty). Try "exercising" it by moving it back and forth with your finger, then try the lenses again. Usually FEE has nothing at all to do with CPU contacts (with a reverse engineered third party lens anything is possible I suppose), but it doesn't hurt to clean them to eliminate that possibility."

You can also try a different Nikon compatible lens. If the trouble is still present, the camera may need to be returned for repair. If the the problem goes away, then the issue is tied to the lens itself. This would mean the the lens needs repair.

I hope this helps and good luck! Please rate my reply - thanks!

No. Pentax and Nikon lens mounts are incompatible, mechanically and electronically.

You should be able to. The Quantaray is a motor drive focus inside the lens and the D200 is a external motor drive. So yes you should. Put it on and see if the auto focus works.

Turn the aperture ring on the lens to its smallest aperture (largest f/number) and lock it there if it has a lock. You control the aperture through the command dial on the camera body, not the aperture ring on the lens.

There is no secret locking switch. If a little gentle jiggling doesn't free the zoom ring, then I can only suggest you take it in to a reputable camera shop for a Clean-Lubricate-Adjust (CLA).

Lock the aperture in F 22. This will get rid of FEE. Now control the aperture settings from the body ( control infront of shutter release )

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Return to vendor for repair or replacement

Any particular tune ?

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.

Quantaray has made several different 70-300mm lenses so I'm not sure exactly which one you have. However, if the lens doesn't have a AF/M switch it's no big deal. Assuming it's an autofocus lens, it's always on. If you want to switch to manual focus, flip the switch on the camera body. If it's an older manual-focus Quantaray lens then the question is moot.

You can get special device for fixing it. (Use ebay.com)

what do you mean, lens support? - a 75-200 is not usually long enough to warrant this, if you mean a support bracket to mount the lens to a tripod, instead of a camera mounting point? btw - sigma made all or most of the lenses for quantaray, so you might try looking this one up that way as well.

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

No. Pentax and Sony use completely different lens mounts.