Barrel Distortion ?

[sanderd]

Hey guys,

Just got my 400D and managed to spend an hour at Coombe Abbey in Coventry this week while Im working away.

I took this picture - and trust me the building does not lean like it looks here on the left !!!

It was taken with the 18-55 kit lens wide open.

I'm guessing this is barrel distortion - but how best to correct it .... if possible ?

I have CS2, so any advice using this as a tool would be great :)

Regards,
D

[Rellik]

Should be the same in CS2. Go to Filter --> Distort --> Lens Correction

[René Damkot]

Also, it's not just barrel distortion; there's keystoning as well. (because the camera isn't level)

[sanderd]

Thanks for the help.

Rene, what is keystoning ? Not come across that term before... :oops:

[Rellik]

René Damkot is right, there is a bit of keystoning there. Basically it is the perspective that causes distortion. You can fix it in the same menu using the sliders in Transform.

[sanderd]

Oh wow, that looks great Rellik ! Thx for the help.

D

[number six]

The 18-55 does have significant barrel distortion at 18 mm. This is a lens problem - most wide angle lenses (even expensive ones) have it.

OTOH, the keystoning isn't a lens issue - it'll happen any time you shoot with the camera pointed up. There are lenses that can eliminate this perspective distortion, but nothing you can do with your lens except stand on a 30 foot stepladder so the camera focal plane is parallel to the building.

As you can see, correcting the keystoning took care of most of the distortion.

-js

[Epix]

263827

[sanderd]

Hey Epix,

What technique did you use ?

[Epix]

CS3 Distort-Lens Correction

[cosworth]

This is where you need a lens that shifts.