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PostPosted: Sat Oct 20, 2007 8:30 pm 
This test was performed using a D40 on a tripod and a 10 seconds timer on all shots.

Let's start with barrel distortion at 18mm. I'm surprised, as I wasn't expecting so much of it. Or maybe I had my expectations too high.

The first photo is of the VR 18-200, the second is of the 18-55. Both are at f/3.5.

Image

Click here for original size.

Image

Click here for original size.

On the matter of barrel distortion at 18mm, both lenses seem to be equally sub-optimal.

Later on, I'll post more photos.


Last edited by luis on Sat Oct 20, 2007 10:17 pm, edited 2 times in total.

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PostPosted: Sat Oct 20, 2007 8:42 pm 
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Very good, Luis.
But please with links to the 100% originals :idea:

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PostPosted: Sat Oct 20, 2007 9:44 pm 
Replaced the files on Flickr for 100% sized ones (i.e. not resized), added direct links below each photo.

Comparing those two, you can see right away, by looking at one of the corners, that the VR 18-200 offers a better image quality at 18mm and wide open at f/3.5, although you can see a hint of colour fringing at the borders of the paper (a red blur where the paper ends).


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PostPosted: Sat Oct 20, 2007 10:24 pm 
Continuing on the issue of barrel distortion, let's see what happens at 50mm.

The first photo is of the VR 18-200, the second is of the 18-55. Both are at f/8, this time.

Image

Click here for original size.

Image

Click here for original size.

Now this is strange. The VR 18-200 now shows worst barrel distortion than the 18-55 and not only that, it's reversed (the middle of each side of the image seems to be "pulled" towards the centre, not "pushed" from it)? Why is this?


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PostPosted: Sat Oct 20, 2007 10:44 pm 
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That's why they call this distortion "pincushion". It does not depend on the absolute focal length but on the specific design of a zoom. So with one zoom you find barrel-dist. at 50mm and with the other zoom you find pincushion at the same focal length...

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