I'm looking for a replacement mount for a Quantaray 28-90mm; for Nikon

SOURCE: quantaray 28-90 mm f/3.5-5.6 af macro telephoto lens for canon

That info can be found right here on Fixya

SOURCE: Quantaray 100-300mm Lens for Nikon

Yes the new nikon D60 needs lens with a built in a/f motor. Your lens will go on and work but you will
have to manual foucs

SOURCE: I have a quantaray 70-300mm

The D40 body can only autofocus if the lens is equipped with it's own in-built autofocus motor. If you have an AF lens which relies on the camera body having the AF drive motor then you have to use MF only. To cut cost and weight, the D40 relies on using lenses with their own AF motors.

Quantaray is a Ritz badge-engineered product, usually based on a Sigma/Tamron design but not always identical to those brands internally. As Ritz don't have a UK/European presence they're unfamiliar to me, but if it's the same as the one shown on this website, then it definitely lacks a drive motor, the second photo down when enlarged clearly shows the mechanically operated AF coupling at the six o'clock position. Again, to cut cost, the lens shown does not have a built in AF drive motor.

If so, your only fix is to either upgrade your body or lens to versions which aren't cut price models, or to simply focus the good old fashioned way, knowing that what you've focused on is what you want and not what the camera thinks you want... ;-)

SOURCE: How to mount Quantaray 70-300mm F/4.0-5.6 Zoom Lens in Sony Alpha DSLR?

This 3rd party lens (like all of them) makes lenses specifically to fit Nikon, Canon, Pentax, Minolta, etc. camera body mounts. Each has a style mount that is unique. You can not simply mount a lens made for use on a Nikon body on a Sony body.

In order to use this lens, it MUST be the model designed for use on a Sony camera. Functionally, the lens will be nearly identical on any camera it is designed to fit, only the mount (the portion that actually mates to the camera body) differs from one lens to the other.

If you bought this lens without specifying it needs to be used with a Sony camera body (and it is for a different camera) it will NOT mount. Determine if the lens is indeed designed for a Sony camera body. You may find additional letters & numbers on the lens that can help you determine which camera body brand it fits by plugging the number into Google for a search. Additionally, the Quantaray brand is / was a Ritz Camera "house" brand. You could probably bring it to one of their stores and learn all you need to know about the lens there.

Good luck!

SOURCE: Quantaray lense wont work on nikon D50

David -

The lowest setting is the highest number; f22 is lower than f4. It's little counter-intuitive, but the lowest setting means the least amount of light - or the smallest aperture opening - not the numerical "f" value of the opening.

Simply twist the aperture ring until the highest value "f" number is selected. Many lenses have a small tab or latch to lock them in this position - if yours does, you can use it to prevent this from happening again. You would use a command dial on most camera bodies to electronically change the aperture opening.

Good luck!