Distortion correction of lenses (for CS3)

I have 2 lenses I like (excellent IQ and range) the EF-S 17-85 and the EF 70-300
I would like to correct the distortion (significant at wide angle on the 17-85)
Anyone knows where can I get lens data that can be loaded to CS3

omer wrote in post #6737262
I have 2 lenses I like (excellent IQ and range) the EF-S 17-85 and the EF 70-300

I would like to correct the distortion (significant at wide angle on the 17-85)

Anyone knows where can I get lens data that can be loaded to CS3

The "distortion" that you are probably wanting to correct has absolutely nothing to do with the particular lens you are using. The "distortion" is probably perspective "distortion" and is virtually 100% caused by your being too close to the subject(s) and choosing locations for your camera that make buildings seem to lean back, lines converge into the distance, etc.

In other words, the tiny little bit of barrel or pincushion distortion inherent in most decent lenses these days is very difficult to see in everyday photography. If you took photos of brick walls (or anything else with a repeating pattern like the brick walls) with the camera carefully aligned to be perpendicular target, you might see a little distortion due to the lens' design.

Thus, you should probably forget about loading distortion correction data into software. Besides, I doubt anybody at Canon will ever publish the data that would be required.

SkipD wrote in post #6737354
In other words, the tiny little bit of barrel or pincushion distortion inherent in most decent lenses these days is very difficult to see in everyday photography. If you took photos of brick walls (or anything else with a repeating pattern like the brick walls) with the camera carefully aligned to be perpendicular target, you might see a little distortion due to the lens' design.

In the summer I was asked to take a group photo of a group who'd been working on a community project. Because we were in a wood, the only way I could fit everybody in was at the long end of my 10-22. The resulting distortion (more than a little) was not very flattering to the people on the ends.

SkipD wrote in post #6737354
Thus, you should probably forget about loading distortion correction data into software. Besides, I doubt anybody at Canon will ever publish the data that would be required.

Luckily DXO have figured all the parameters out themselves. Their software did a good job of fixing those distortions. It's just a shame that the rest of the package is not as good.

It is possible to do something about the distortions in PS, but it ain't easy. I'd love it if lens data for the 10-22 were available.

hollis_f wrote in post #6737703
Because we were in a wood, the only way I could fit everybody in was at the long end of my 10-22. The resulting distortion (more than a little) was not very flattering to the people on the ends.

The "distortion" you are referring to was caused by the fact that you had the camera too close to the subject to avoid it, and NOT because of any pincushion or barrel distortion caused by the lens design.

hollis_f wrote in post #6737703
It is possible to do something about the distortions in PS, but it ain't easy. I'd love it if lens data for the 10-22 were available.

What do you expect in the "lens data"? All that could be dealt with there is the true distortion caused by the design/build of the lens. That is, in fact, quite minor when compared to perspective distortion folks commonly get when using short focal lengths and work up close to their subjects.

SkipD wrote in post #6737741
The "distortion" you are referring to was caused by the fact that you had the camera too close to the subject to avoid it, and NOT because of any pincushion or barrel distortion caused by the lens design.

Yes, I know that. We were in a wood, there was no way I could get any further away from them. Sometimes the world just isn't perfect.

SkipD wrote in post #6737741
What do you expect in the "lens data"? All that could be dealt with there is the true distortion caused by the design/build of the lens. That is, in fact, quite minor when compared to perspective distortion folks commonly get when using short focal lengths and work up close to their subjects.

And DXO optics have the software that will look at what lens you've used and what distance you've focussed at. It the uses that data to correct the distortions due to the lens and perspective.

hollis_f wrote in post #6737765
And DXO optics have the software that will look at what lens you've used and what distance you've focussed at. It the uses that data to correct the distortions due to the lens and perspective.

That is interesting, to say the least.

Can it also automatically (or manually) compensate for the relative angles of the subject material and the camera? I'm referring to things such as aiming the camera upwards at a tall building using a short lens and thus getting extreme "tilting" of the building backwards and the converging lines representing the sides of the building.

hollis_f wrote in post #6737765
And DXO optics have the software that will look at what lens you've used and what distance you've focussed at. It the uses that data to correct the distortions due to the lens and perspective.

I'm skeptical.

Can I get a virtual tilt-shift to go with that?

Thanks for the comments
I was hoping there is a way to take data as shown in the review of say: http://www.photozone.d​e/canon-eos (distortion part) and use it in PS
I do agree that even at wide angle setting the distortion in most cases is hard to notice (but not always)
Excuse my ignorance but what package is DXO and does it work as a plug in to PS

SkipD wrote in post #6737777
That is interesting, to say the least.

Can it also automatically (or manually) compensate for the relative angles of the subject material and the camera? I'm referring to things such as aiming the camera upwards at a tall building using a short lens and thus getting extreme "tilting" of the building backwards and the converging lines representing the sides of the building.

Dunno, never tried it. I'm really not impressed with it as a raw processor. It's far too slow. But it did do a reasonable job when I needed it for correcting lens distortion in that one case.

Here's what they say about that particular function. They even show what they can do with a fisheye photo.

Is this what you are talking about ? I use it in CS2 with very good results.

http://livedocs.adobe.​com …5a-BD9A-38B3737A9A19.html

george w