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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
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Take the same shot with and without the hood?
I get the same effect with my Sony 18-70mm. at the 18mm. end.
Extending the lens slightly or removing the hood removes the problem.
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
Could also be sloppiness in the barrel causing it to rest of the central axis. The old Canon EF kit zoom 17-55 had a lot of looseness I recall and could vignette. Worth checking on your Nikon lens.
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 ??
A wild guess.
Is that to do with the relative sizes of their sensors?
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.
The shadows are more hard than anything, I would have thought that if it was vignetting then the "shadows" would be in all four corners.
A light crop gets rid of it in post processing, but why only on the D3100 and not on the D7000?
Perhaps you have the answer.
I know its not critical but its got me annoyed now so am determined to find the answer.
Even borrowed another lens hood incase mine was misaligned or misshappen still the same damn it getting frustrated now.
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).
No shadows with hood off
no shadows with 18-55 kit lens but still the same with borrowed 18-105
I would have thoght that if it was lens sloppiness it would be more pronounced with lens extended rather than retracted?
Only happens when aperture wide open
Starting to think it must be an internal problem with the D3100.
Borrowed another 18-105 and went through all the previous tests still the same.
Have now also borrowed another D3100 from my local shop so I will take all three cameras and both lenses out at the weekend and try various settings focal length appertures shutter speeds iso etc etc to see if I can narrow the problem down even further
If that does not identify the problem I suppose I will have to take my D3100 in for examination maybe I could return the wrong D3100
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