Question about Sigma 18-200mm f/3.5-6.3 for Nikon

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Sigma 18 -200 lens with D40x

Brand new Sigma 18-200 lens.
old 18-55 works perfectly.
Can manually focus, but on autofocus nothing
Don't know what settings if any to use !!!
i am using a nikon D40x.
Is this lens compatible ?

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This lens is NOT compatible as the body doesn't have a motor . £200 wasted

Posted on Jun 09, 2008

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Posted on Jan 02, 2017

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1 Answer

All of a sudden every picture I take with the 55-200 zoom lens is blurry and slightly out of focus. Pictures with the 18-55 lens are still sharp. I have been using that 55-200 lens for years for sports...


Simplest answer is that you may have accidentally flipped the focus switch (A/M) on the lens to M. This turns off autofocus for that lens (which you might need to do if autofocus just can't resolve the image). Try turning it back to A.

Another possibility is that you're using an autofocus target different from the one you're expecting. The problem would be apparent regardless of lens choice, by being in focus in a different part of the image. You can press the arrow keys (while holding shutter release down halfway) to change AF targets, or change a menu setting to simply choose the closest target.

The shooting modes have no effect on focusing ability.

The camera would likely detect other focus-related problems (like servo failure).

May 09, 2011 | Nikon D40x Digital Camera

1 Answer

When I attach a MC4 conversion lens to my 55-200 dx lens on my Nikon D40x camera body the camera has a hard time focusing and many times will not take the phote.


The camera is spec'd to autofocus with lenses that are f/5.6 and faster. The conversion lens is costing you two stops, so it's a wonder you're getting any autofocusing at all with a lens slower than f/2.8.

Unfortunately, it's tough to try to get around the laws of physics. You're just going to have to focus manually.

Feb 20, 2010 | Nikon D40x Digital Camera

1 Answer

My Sigma 70-300 doesn't workin autoFocus mode. It


That lens is not an AFS type lens. The D40x camera only uses AFS compatible lenses. You could still mount and use it in M, but it will never give you autofocus or TTL flash.

Oct 14, 2009 | Sigma 70-300mm f/4-5.6 DG Lens

1 Answer

Automatic focus not working


The D40x only autofocuses with the latest AF-S (and old professional AF-I) lenses. Most traditional (screw-type) AF lenses from 1986 through today will not autofocus on the D40x. If your lens says "AF-S," you're fine.
Most lenses sold today for the D40x are AF-S, and so is the included 18-55mm kit lens. Many non-Nikon lenses from Tamron, Tokina, Quantaray, Sigma and anyone other than Nikon still won't autofocus on the D40x. Try before you buy, but honestly, there isn't much the included 18-55mm lens won't do.
Autofocus systems are fast, but not usually instantaneous. You have to hold the shutter down halfway as you compose the first shot so the AF system can focus and lock, and then the camera fires instantaneously when you press the shutter the rest of the way. See Preventing Shutter Delay for more.

Jul 14, 2009 | Nikon D40x Digital Camera

1 Answer

No autofocus


We tried the same lens on another Nikon (D90) and auto focus did not work.
We mounted a new set of lens on the original D40x, and it worked.
Turns out the 2 year Nikon lens (18mm-135mm) was bad. Nikon lens have a 5 year warrantee. The lens will be sent back to Nikon with no service or shipping charge.

Thanks,
K

Dec 08, 2008 | Nikon D40x Digital Camera

1 Answer

Not auto focusing


It could be that the autofocus switch has become unglued from the frame and so it doesn't ever switch on. If your camera doesn't indicate that autofocus is on, but you're not getting an error message, then this might be the problem. Unscrew the two screws that hold the AF switch onto the lens, and see if the underlying PCB upon which the switch is mounted has come loose. If you, take the lens apart from the back and use double-sided tape to re-adhere.

Jun 07, 2008 | Sigma 18-200mm f/3.5-6.3 for Nikon

1 Answer

70-300DL Macro Super autofocus problem


It is likely that the lens will need parts. Sigma is not the best for repair parts. Typically, the small nylon gears that control the AF break. It is still a useful piece in manual focus. Repair costs would likely exceed its value.

Feb 17, 2008 | Cameras

2 Answers

Sigma 55-200mm F4-5.6 DC


The D40 will only AF with lenses that have their own focusing motor (Nikon AF-S and Sigma HSM). This lens will not focus.

Aug 10, 2007 | Sigma 55-200mm f4-5.6 DC Lens

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