I have a Quantaray for NIKON SC 28-200mm 1:35-5.6 lens for my NIKON d100. It was working fine yesterday, but today the focus is frozen at infinity. I know this lens only works at ap 22, however, it should still give manual control over the focus which does not have a lock. How do I unlock the focus?

SOURCE: auto focusing problem

On a Nikon D40, set the control knob on top to M for manual. The lens will work just fine. This is for a manual focus only. I use a D40 with a Phoenix 500/1000 mm manual focus with great results.

SOURCE: Quantaray 28-200mm Aspherical IF

Usually.
Quantary Lenses are made by either Sigma or Tamron That lens was usualy made buy sigma. the way to tell is to take it to a camera store that sells 28-200 lenses and hold your lens next to the sigma or tamron. They will look the same just with a different name. one of the main difference's between the store brand quantaray and sigma is that alot of time the metal bearings used in the name brand are replace with plastic ones for the quantaray. I tell you that just so you know why the sigma lenses cost more.

you can also find broken ones on online auction sites and use them for parts.


hope you get it working,
Caleb

SOURCE: flash problems with Quantaray 28-200MM F3.8-5.6

Try setting the camera to the Aperture Mode A or the Manual Mode. I am assuming that you are using the AUTO mode and due to this the aperture is set really high may be a 60 ( read the green text through the eye piece and the second number will be the aperture number)

With a low aperture number like 5.6 or so the photo should be clear and not dark. I am not an expert user but this could be a solution if the problem was occurring when the camera was in AUTO mode.

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Sachin Gharat

• 28 Answers
• Posted on Jul 12, 2009

SOURCE: quantaray 18-200 auto focus quit working

HI I AM SAGHA I THINK YOUR LENS MIGHT HAVE A PROBLEM WITH MAGNETIC AUTOFOCUSING SENSOR UNIT.BETTER GET THE SENSOR REPLACED WITH THE ORIGINAL ONE.AND UR LENS WILL BE OK.TRY THIS FROM PROPER SERVICE PERSON DON'T TRY YOURSELF

SOURCE: I have a Quantaray 28-200 mm f/3.8-5.6 AF Zoom

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

Nikonian.org