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28-300 Reverse Vignette Problem

JohnE Nikon

New HArtford, US
932 posts

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JohnE Nikon Registered since 15th Jun 2010
Thu 25-Apr-13 01:14 AM

I noticed the below problem yesterday when I was out shooting with my 28-300 lens. I underexposed to get a deeper blue in the sky with the anticipation of a B&W conversion.

When I started to process this image there were a few presets that brought out a disturbing lens artifact.

Beside the normal vignette that I expect when shooting wide open, I noticed an area of decreased density centrally. I have posted a few images. The original color image and a B & W version that is purposely over-processed to bring out this artifact.

I looked through my entire LR collection, which includes about 3600 images shot with this lens. It was hard to find.
It seems with focal lengths above around 70 and f stops below 8 I could tweak the images to bring out this subtle reverse vignetting in the center.

Here are my questions?
Anyone ever seen this?
Should I not be worried? it's only apparent wide open on a blue sky when underexposed. It's only readily apparent when I significantly push pixels. It too me 3600 images to notice.
Is this a trade off with a super zoom lens?
Please let me know what you think.

Also please don't mention the dust. I just cleaned sensor and can't see it in any other images and I don't feel like discussing dust on the D600. there's enough posts on that.





Click on image to view larger version



Click on image to view larger version

Camera: NIKON D600
Exposure: 0.001 sec (1/800)
Aperture: f/5.6
Focal Length: 210 mm
ISO Speed: 160
Exposure Bias: -0.67 EV




Click on image to view larger version



Click on image to view larger version

On this B&W I turned off LR's lens correction, in case that was doing something funny to the native vignette
Camera: NIKON D600
Exposure: 0.003 sec (1/320)
Aperture: f/7.1
Focal Length: 300 mm
ISO Speed: 160
Exposure Bias: -0.67 EV





Click on image to view larger version

This one was an older one. I turned off LR auto lens correct here too.
Date: 11/2/12, 10:31 AM
Dimensions: 2048 x 1367 pixels
File Name: _DSC2366-Edit.jpg
File Size: 763.98K
Camera: NIKON D600
Exposure: 0.001 sec (1/1000)
Aperture: f/5.3
Focal Length: 112 mm
ISO Speed: 500
Exposure Bias: -0.33 EV
Flash Used: No


Thanks for any input in advance

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JohnE Nikon
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"Cameras and lenses are simply tools to place our unique vision on film. Concentrate on equipment and you'll take technically good photographs. Concentrate on seeing the light's magic colors and your images will stir the soul." Jack Dykinga

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