Incompatible D90 and Sigma 100-300mm f/4 APO EX IF HSM

[ptiet]

Why is my D90 took poorly focus and over exposed photos and poor contrast with my Sigma 100-300mm f/4 APO EX IF HSM while my D70s demonstrates otherwise?

I recently sold my D70 for the D90 and was happy over all with the sharpness that it revealed with my 50mm and its kit lens. However, I was disappointed with the result when hooked up with the Sigma 100-300mm f/4 APO EX IF HSM.

I finally purchase a D70s body only to go with the Sigma 100-300mm as it matched up so well with great contrast and sharpness.

The question is why?

 

[skylon]

I had the same lens on my D90 today and had no problems. Not sure what's going on in your case.
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Just Shoot It.

 

[Brooks P]

You need to post some sample picture along with the exif data before anyone can give you a meaningful answer. You wouldn’t walk to your mechanics garage and ask him why your car at home won’t start; basically that is what you are doing here with your question.

Any weaknesses in your technique will be more evident with the D90 and its 12MP compared to the D70 and its 6MP. Then more mega-pixels the more technical errors show; I quickly discovered that I had to be a lot more careful with my D90 than I had been with my D50. The flip side is that when you do everything correctly the D90 is the more capable camera.

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While amateurs change the camera’s settings; many Pro’s prefer to change the light.

Brooks
http://bmiddleton.smugmug.com/

 

[Snapless]

I was just talking to a Nikon dealer today about the Sigma 50-150 2.8 I am considering. I've heard some people have had focus problems. The dealer said if the Sigma supplier is notified of the camera and model, they can update firmware for the lens before shipping as that is usually the source of the problem.The D90 has very complex communication with metering and focus info from the lens, and I suppose this is why the G series nikons work so well . I would assume you could return your lens for a similar fix, Sigma is very good at solving these issues, and your lens is very highly rated.

 

[ptiet]

Thanks. I never thought that camera lens can be upgraded with firmware.

I will perform some test shots when I between the two cameras when I get a chance. Unfortunately, I have deleted all the non keeper photos.

I have specifically tested at various focal length and all out of focus and the contrast was very poor. I was very surprise at first and thought it may be the D90 is at fault but no issue with Nikon Dx lens and my Nikon 50mm 1.8.

 

[ptiet]

Here is a link to some of the photos.
http://members.iinet.net.au/~qtiet/dpreview/
Please note on where the camera focal points are on the NEF files.

I have specifically set the camera on high F stop and shutter speed but it remains blurry.

 

[ptiet]

any taker to explain the poorly focus and exposure?

 

[debruyne]

The "bad" jpg's don't have the NEF counterparts...
I downloaded 1 NEF and that looked ok. BUT AT ISO 800?????

Put it on 100 or 200 on a bright sunny day. You also used Dynamic area for 2 boys sitting on a bench. I'd like to have the nef for the 022jpeg.

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http://s259.photobucket.com/albums/hh315/alex_837/
Just trying to get better.....

 

[Andrew Ellis]

When I had my 100-300 a few years ago, I was getting over exposed photos on my D200. I contacted Sigma UK and sent the lens back to them for "calibration". They updated the on chip firmware in the lens and it was all sorted when I got it back. Just an idea ?

Then sold it some time later and still regretting it.
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Lets make pictures, not war........

 

[ptiet]

Thanks for that. I will contact Sigma ASAP.

The question is, once I have the upgrade will it be compatible with my D70s.

http://members.iinet.net.au/~qtiet/dpreview/091213-242.NEF is another obvious poorly contrasted shot despite stopping down the aperture.