Question about Sigma Macro 50mm f/2.8 EX DG for Nikon AF

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Hazy central area in images

Hello, I'm trying to get a handle on an image problem I'm having when I use the Sigma 50mm Macro with my Nikon D70. The issue is that when shooting extreme closeups, the central portion of the image is washed out and lacks good definition. This is particularly noticeable on medium to dark images, as you can see in these pictures I've posted on my Google account: http://picasaweb.google.com/RLT1960/SigmaLens.You can get more info about the specific pictures by clicking on the "more info" link for each picture. This is not a problem with the camera, as the image problem does not occur with my 18-70mm Nikon lens. I've cleaned the sensor, removed the haze filter (thinking it might possibly be a problem with light reflecting on the filter) but the problem persists. Any help would be much appreciated! Lee

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  • Lee Rouse Apr 01, 2007

    Sorry, the link to my Google photos did not work. I'm uploading an image to illustrate the problem.

    Lee

  • Lee Rouse Apr 03, 2007

    I wish it was that simple. I've checked front and rear elements, cleaned them, but the problem still exists. One interesting point- this problem doesn't occur consistently. Seems to occur when I'm going for an extreme closeup with the lens at a high F/stop and at its minimal distance from the subject

    Lee

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Please try to look at carefully at the center of your front and rear lens,see if there is a fungus or any dirt in the middle,or try to look reversely full open facing the light so that you may confirmed the cause of the problem.

Posted on Apr 02, 2007

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1 Answer

Sigma lens manuals


Chuck, sorry for the late response. Last days I had to work through several hundred anonymous questions. Most irrelevant and not complete, so I could not answer most of them, but I had to read them all.
Sigma, does not have a service, where you can download a manual. But the manuals from Nikon, most of the time don't tell anything about how to use the lens.
I found a page with all specs. The link is down here.

I have to guess why you did put the question here in the first place. I think because you have a Nikon camera without a focus motor. Like a D3x00 or the D5x00 or a D40 or D60. (for the x you can add 0 1 2 or 3)
If you have one of these camera's the lens can't be used with auto focus You only can use the lens in manual focus. Most other camera's from Nikon, like D80 D90 D7000 D300 and more expensive, all do have a focus motor and can work with this lens in full automatic focus mode.

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