wide angle shots

[bigadg]

hi
just took some photos of my local church with my sigma 12-24 wide angle lense
on my 20d
everything seems to be at the wrong angle (leaning backwards)
can this be put right in ps cs
stu

[cactusclay]

I don't know if you can fix that in ps or not, but you can make sure that the film plane is level when you shoot. Wide angle lens tend to distort buildings anyway, but if the camera is tipped at all it makes the linear distortion worse. This is why they created perspective control lenses.

[Persian-Rice]

Barrel distortion. You are bound to get it when you shoot in fisheye territory.

The best I have tried is the plugin on this page.
http://home.no.net/dmaurer/%7Edersch/Index.htm

[cactusclay]

Convergence?

[Jim_T]

It's convergence... The wide angle exaggerates perspective and causes buildings to lean.. They lean away if you're shooting up at them and they lean towards you if you're shooting down on them :)

I use the GIMP which has a perspective correction tool.. I think you can add the panorama tools plugin to CS which can fix it.. (CS might have something already.. Not sure since I don't use it)..

[bigadg]

jim t

you have hit the nail on the head thankyou
now how do i sort it?

stu

[Brianbar]

Yes you can correct this in PhotoShop CS, but you require DCE Tools (Plug-in) to do so.
It has Perspective Correction along with many other useful tools.
I use it all the time when using my 17-40L.

Brian
Winnipeg

[DocFrankenstein]

hehe...

It's the barrel distortion plus perspective distortion.

Good luck photoshopping that!

You need to keep your film plane parallel to the "wall" you're shooting... And then correct the barrel distortion with photoshop.

you'll lose 50% of your resolution, but you'll end up with a usable image.

Cheers

[S230]

Go pickup this month's free edition of "Here's how" magazing from Blacks photography. On page38 it talks exactly what you are experiencing and by chance, it demonstrated a photo of a church too.. it also step by step show how to use photoshop to fix this problem. Hope this helps.

[BoySpot]

You don't have to have a plug in for CS to do this. It can be done manually with the free transform tool. Scott Kelby's book has a simple tutorial on it. I won't try to better his descriptions by repeating them here (and it is a little long for a post) but you drag the upper corners out of the image to straighten the verticles up. It works pretty well on the ones I have tried. You might want to see what CS can do for you before you start investing in plug ins.

[12345Michael54321]

If you're describing "keystoning" (buildings or other tall objects look like they're falling away from you) it can be corrected in Photoshop, and you needn't use a plug-in. The details of the process can be found in most "How To Do Neat Stuff With Photoshop" type books.

I have one book right here on my desk, "The Photoshop Book for Digital Photographers," by Scott Kelby, which has a rather nice section on "Repairing Keystoning Without the Crop Tool." (It's a pretty good book. Cost about $40, but it can be picked up used for about half that.)

You could also do a Google search on "keystoning photoshop" and probably find a few hundred websites that'll walk you through the steps.

[bigadg]

thankyou for all the replys

still not sure what to do though
stu:cool:

[S230]

Not sure if I phrased it correctly. The magazine I described is FREE. It can be picked up at some photo stores but u need to search. The link is their web site that also talked about this.
http://www.hereshow.ca/index.php?cmd=article_detail&issue_id=16&article_id=128

[JMAS]

Hi,
Go check this old thread:
http://www.photography-on-the.net/forum/showthread.php?t=42401&highlight=vasco+gama
Scott (Scottes) and Cameron (Lomond) answered beautifuly to a similar problem I had with a bridge.
It's quite simple.

[Jon]

For the record, any barrel distortion in his pictures will be minimal. The 12-24 isn't a fisheye, even at widest zoom; it's a rectilinear lens. So it's just keystoning/perspective.