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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 10 Nov 2013 (Sunday) 19:00
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Distortion with 17-40mm - Is this normal?

 
spiderm0nkey
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Nov 10, 2013 19:00 |  #1

Hi everyone, I have been experiencing some unusual distortion issues with my 17-40mm and would like to know if I have a lemon or if this is normal.

The photo below was shot at 23mm. I lined up the bottom of the boot with the edge of the frame. Once I got the image up on the computer I noticed that the top of the boot is slanting to the right, while the bottom remains perfectly parallel to the frame. Thoughts?

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paddler4
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Nov 10, 2013 19:09 |  #2

looks like you were not holding the camera parallel to the back of the car.


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spiderm0nkey
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Nov 10, 2013 19:16 |  #3

True. I went back and tried again, lining up the boot latch with the centre focus point and slowly brought the camera up. Still a slight tilt to the right at the top of the frame but nowhere near as noticeable. Such a fickle lens! I have much to learn still.


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scottda
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Nov 11, 2013 07:55 |  #4

spiderm0nkey wrote in post #16440733 (external link)
Such a fickle lens! I have much to learn still.

Welcome to the world of wide angle photography. Any tipping of the camera (up/down, side to side) with respect to your subject will add some distortion. The wider you go the more the distortion.


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MalVeauX
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Nov 11, 2013 08:47 |  #5

Heya,

With a wide angle, if you're off by even 1 degree, let alone less than a degree, a straight line will no longer be straight, and over 3000+ pixels that form that "line" will definitely show you how it's not actually straight.

It looks to me like you lined up with the carpet in the back, not the actual vehicle frame.

Very best,


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xhack
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Nov 11, 2013 11:19 |  #6

Yup - UWA is pretty unforgiving. Even when you think you've got it right, the ribbing in front of the carpet tells a tale. Very easy to do.


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liquefied
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Nov 11, 2013 11:28 |  #7

Looks like you tried to line up the bottom of the frame with the edge of the trunk carpeting which may or may not have been parallel to the frame of the car. Take a look at the bottom edges of the tail lights and you can see that you're not parallel to the car.

All of this is easily fixed using the transform function in photoshop.



  
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plumgoo
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Nov 11, 2013 11:34 |  #8

I use my 17-40 extensively at the wide-end of it's range, and learned that you have to be dead-on-target in order to avoid this type of thing from happening.


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jdickerson
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Nov 11, 2013 11:35 |  #9

If you simply call it [I]perspective[I] instead of distortion you'll be much happier!

At least that's what I tell my students to do.

JD




  
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spiderm0nkey
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Nov 11, 2013 13:00 |  #10

Thanks everyone :) I'll have to work on going a bit slower in future and thinking a little more about the shot before I hit the shutter.


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PH68
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Nov 11, 2013 13:10 |  #11

As above.

All wide angle lenses can give lots of weird distortions.


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SkipD
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Nov 11, 2013 13:49 |  #12

spiderm0nkey wrote in post #16442564 (external link)
Thanks everyone :) I'll have to work on going a bit slower in future and thinking a little more about the shot before I hit the shutter.

It might help you to read the tutorial several of us put together on the subject of controlling perspective. Please read our "sticky" (found in the General Photography Talk forum) tutorial titled Perspective Control in Images - Focal Length or Distance?.


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Distortion with 17-40mm - Is this normal?
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