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DPChallenge Forums >> Hardware and Software >> What kind of distortion is this?
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 12/16/2005 11:21:27 AM · #1
I was rumaging over at Luminous Landscape and found a comparison of the 24-105L and the 28-135L. They took a shot of a building from the same place at 28mm for each lens. Look at the picture and not the difference in "tilt shift" for lack of a better term. What do you think this is from and what is it properly called?

It's halfway down this page

Message edited by author 2005-12-16 11:22:06.
 12/16/2005 11:37:12 AM · #2
Simple....they're telezooms.

The 24-105 @28mm is not at it's widest zoom. But the 28-135mm @ 28mm is at it's widest zoom, hence it will have much more wide-angle "distortion".

It'd have been better to compare at 50mm which should be closer to sweet for both lenses.

But it is a good comparison to show the pincushion effect.
 12/16/2005 11:58:16 AM · #3
Originally posted by theSaj:
It'd have been better to compare at 50mm which should be closer to sweet for both lenses.


Scroll down a little further and they have the lenses at a 50mm comparison.
 12/16/2005 12:02:51 PM · #4
Correct me if I'm wrong:

Pincushion distortion happens at the telephoto end
Barrel distortion happens at the wide angle end

To me there appears to be a slightly different angle of view and the image taken with the 28-135 seems to taken from a lower point giving more perspective distortion.

I'm not really seeing pincushion or barrel distortion. But then again maybe I don't know what I'm looking at/for.
 12/16/2005 12:55:29 PM · #5
Pincushion/Barrel distortion

(yes, they're the inverse of each other...LOL)

I couldn't remember Barrel so I hoped it'd convey the thought close enough.
 12/16/2005 12:57:12 PM · #6
Originally posted by theSaj:
Pincushion/Barrel distortion

(yes, they're the inverse of each other...LOL)

I couldn't remember Barrel so I hoped it'd convey the thought close enough.


Just to confuse, right? ;O)
 12/16/2005 12:58:31 PM · #7
I didn't think it was either. Those effects should look like a "space warp" meaning the distortion proceeds radially from the center.

I don't think it's a different perspective either as the edges of the shot are fairly similar (unless it's a crop). The shot on the right seems slightly wider so perhaps the 28 designation isn't truly 28 or the tester wasn't too careful with where he set the lens.

Either way, the 24-105 shot looks much more pleasing which is good, because that is the lens I want.
 12/18/2005 10:42:05 AM · #8
I know this is just restating what someone else said, but if you are seriously thinking about checking out the wide angle performance of the 24-105, I would suggest having a look around for shot comparisons or performance evaluations that are actually at full wide for that lens.

Even going from 24-28 could make a huge difference when considering the edges of the performance for that lens.

I know you already know this, but uhh, maybe it's a reminder?
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