DSLRUsers.com

The corners of the photo as marked in red appears to be stretched. The photo was taken in Auto mode with the kit lens.

Opinions would be appreciated.

http://www.pixspot.com/index.php?cat=10054

Vignetting is shown by a falloff of light in the corners, but certainly you have your share of distortion here, some of it is perspective effects and some is lens distortion by the look of it. This was taken at the 18mm end I guess? Even so, it seems rather extreme for the kit lens...

Cheers

Hmmm..Did you shoot with the lens hood on or off. What focal length, I would guess from the distance it was close to 18mm (shortest focal length). Vignetting is a darkening in the corners more than the distortion you see here. This is more of a fisheye from close subject and short focal length causing the distortion.

I haven't had the issue but I think I remember seeing that in NikonView? Capture? there is a lens distortion repair tool.

Anone else?????

Andy

It was definitely taken at 18mm and the lens has the hood as well as B&W's mrc UV filter.

what is the reason of distortion- photographer or camera or lens??

how can it be prevented in future?

This is not vignetting, which as has been pointed out already, is a falloff of light in the corners.
This is distortion, and is not unusual at the wider end of the kit lens, which after all, is 18mm.
The effect can be exaggerated when the horizonal axis of the lens is moved away from true horizontal.
This is what has happened here - the photographer has angled the lens downward to include the cake in the shot, thus disturbing the perspective in both upper corners. It's no biggie.
To avoid it, the photographer would need to lower shooting position so that lens barrel stays horizontal.
But I think most of us would accept this as being a normal shot the way it is.

I second to cricketfan, it's distortion and you shot this on high level of other positions.
Hope NC 4.13 can fix it with de-fisheye

This is vignetting:

http://www.pixspot.com/displayimage.php?album=31&pos=2

Yup. That is vignetting.

yup distortion alright.

SLR Photography .... ie traditional film

50mm focal length is 1:1 ratio this will give the most narural life like images, real size if you like, striaght edges etc.

less than this and you start to head into wide angle and finally fish eye

http://redvip.homelinux.net/varios/Niko ... sample.jpg

(i just googled that)

heading the other way past 50mm you get Barrel distortion where straight lines become curves (pincushion as well)

http://images.google.com.au/imgres?imgu ... a%26sa%3DG

The D70 of course has a 1.5x ratio making the 18mm the equivalent of 27mm still very wide angle and less than 50mm ... hence in extreme edges you get this happening..

hope this makes sense ..its 3am over here.

ishman wrote:It was definitely taken at 18mm and the lens has the hood as well as B&W's mrc UV filter.

what is the reason of distortion- photographer or camera or lens??

how can it be prevented in future?

Basically, too close to the subject with too short a focal lenght. The kit lens is not really designed for that type of shot. If you caould back up a few feet and zoom in a little you should see better results

Other points to consider are sooting mode and white balance.

Keep shootin!

Andy

Agree with all of the above.

The other thing to remember is that a bit of wide angle distortion can be great for effect - it isn't just a bad thing It is just a matter of knowing what happens when and why, and getting what you want.