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D200 back focus?

Dave Lee , May 07, 2006; 01:18 p.m.

Anyone notice the D200 back focus problem? I have been testing it with a number of different manual and auto focus lenses and when I mounted a Tamrom SP 20-40mm lens and pointed the camera at an infinity subject (some buildings some ways away from my balcony) the camera back focuses and the image isn't sharp! When I change the zoom to 40mm the camera correctly focuses at infinity. Other AF lenses don't do this.

Is this a lens problem? I put the lens on my n8008s and it focuses correctly at infinity at both 20 and 40mm.

Anyone have any ideas? This kind of freaks me out and it needs to be documented.




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Vivek . , May 07, 2006; 01:23 p.m.

Make sure you the correct diopter setting for the D200 viewfinder.

Vivek . , May 07, 2006; 01:26 p.m.

Make sure you have the correct diopter setting for the D200 viewfinder.

Robert Hooper , May 07, 2006; 01:32 p.m.

I suspect an antiquated chip in the Tamron lens to be the cause of your problem.

Michael R. Freeman , May 07, 2006; 01:39 p.m.

"Is this a lens problem?"

Most likely, and that's certainly what Nikon will tell you if you were to ask, since it apparently only occurs with this specific *Tamron* lens.

The D200 has compatibility problems with some Sigma HSM lenses. I guess one should not be surprised if there may also issues with other third party lenses, particularly if it's an older lens. Canon users have experienced this to a much greater extent than Nikon users. Expect more of the same in future generations of DSLR's.

Ellis Vener , May 07, 2006; 01:39 p.m.

Any and all SLR ,especially autofocus, cameras can have focus alignment problems. Are you judging by the image in the viewfinder or the iamge itself?

On the other hand it may be that the D200 is pointing out inadequacies with your lens that film doesn't catch. And that is a thing that is heavily documented.

Shun Cheung , May 07, 2006; 03:40 p.m.

Thom Hogan has pointed out a few times that the D200 does not really have 11 AF points. Some of the outer "points" actually represent a much larger area then indicated. That might be the problem if you are using one of the outer points.

Hogan has pointed that out several times in the DPReview Forums. Here is one of them but there are better explanations that I am unable to locate at the moment: http://forums.dpreview.com/forums/read.asp?forum=1021&message=18265799

Edward Horn , May 07, 2006; 06:01 p.m.

Diopter shouldn't have anything to do with the problem unless you are doing manual focus.

Dave Lee , May 08, 2006; 12:06 a.m.

Thanks for all your responses. After a day of field testing with the D200 I've resigned myself to just turning off AF when I am using the Tamron 20-40mm at the 20mm setting. It is a disappointment but not such a big deal. I can see the fresnel go a little off when it focuses, and I know that it should be infinity, not 10 feet.

Otherwise the D200 is proving itself to be quite a nice camera!


New 777-200, Boeing Field, Seattle, Nikon D200

Lex Jenkins , May 08, 2006; 04:18 a.m.

Dave wrote: "Anyone notice the D200 back focus problem?"

*Does* a back focus problem actually exist with the D200? Your statement applies that this condition exists and that it is, at least, endemic.

I'd like to see owners of the D200 exercise the greatest discretion and precision in describing problems, if any exist. Otherwise Nikon forums across the internet will be flooded with anxious posts pleading "Is this a back focus problem with the D200? I heard there was a back focus problem with the D200. How can I spot the back focus problem with my D200? Why did Nikon sell me a D200 with a back focus problem?"

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