Nikon 18-105 vignetting on D3100 but not on D7000

NEWDIGIT

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13 Apr 2012 - 1:24 PM

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I have noticed that when using an 18-105 on my D3100 between 18-30mm and wide open, I am getting shadows showing top right and bottom left in the final images.
Thought perhaps it could be UV or polarising filter related I do not use both filters at the same time but no still the same with filters removed , so I think it must be the petals from the hood.
This does not occur when the same set up is used on my D7000.
Has anyone had the same problem if so what is the cause?
The D3100 was bought last year when my D7000 developed a jammed shutter a few days before a carribean trip

thewilliam

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13 Apr 2012 - 2:15 PM

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Some petal lens shades will go on in one of 4 ways: two right and two wrong.

My guess is that the shade is on the wrong way with your D3100 or it might not be properly engaged in its click-stop. When filters cause a vignette, it'll happen in all 4 corners equally

NEWDIGIT

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13 Apr 2012 - 3:56 PM

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thanks all been out in the garden and trying different ideas
Trouble is as I said it only happens on the d3100 NOT THE d7100.
Just to clarify D3100 set upon tripod 18-105 lens set to f3.5 at 18mm hood on hey presto shadows
take lens off the d3100 put it on d7000 set d7000 on tripod lens at f3.5 at 18mm hood still on same view NO SHADOWS.
Surely if it was the hood, even I think it is looking at the shadows why only on the D3100 ??

LenShepherd (e2 Member)

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13 Apr 2012 - 4:27 PM

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What do you mean by "shadows"?
If you mean hard black corners. This is mechanical vignetting caused by filters or a mis-aligned lens hood.
If you mean gradual corner darkening (I think you do) this is optical vignetting caused by the lens transmitting less light in the corners, particularly at the wide end wide open.
The issue can be reduced in post processing.

Sooty_1 (Critique Team)

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17 Apr 2012 - 8:42 AM

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So, does it happen without the hood on? Does it happen with any other lens?

It may be sloppiness in the lens barrel causing mis-aligned elements in the optical train. Have you tried the camera upright? Or tried moving the barrel of the lens off centre in different directoins with your hands?

BTW, if you stop the camera down to the smallest aperture, the graduation would be much sharper if it was outside the lens (eg the hood). If there is no difference, it is an internal problem (maybe with the sensor).

Nick