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07-12-2013, 01:05 PM   #1
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Grid Paper / Distortion Lens Test?

I've heard a way to test lens is to take a picture of a grid to look for distortion.
Is there any products that worked well? Is it possible to print your own for the test?
Any recommendations?

07-12-2013, 01:09 PM   #2
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A brick wall is commonly used to check for angular distortion and sharpness across the frame.
07-12-2013, 01:19 PM   #3
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You could make a grid in a paint program, display the grid on a computer screen, and photograph it.
Save the grid in a file for later use. Only an idea, never tried it myself.
07-12-2013, 01:24 PM   #4
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What about a book of ordinary graph paper photographed.

07-12-2013, 02:24 PM   #5
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This is part of the background grid in Inkscape, a free vector drawing program, saved as PNG from a screen dump:



Inkscape. Draw Freely.

If it has not enough contrast you can draw lines on top of it yourself. Use 'snap' to draw them exactly horizontally and vertically.
Several small grids (like this one) can be merged to make grids of any size. You can print them too, of course.

Last edited by Kobayashi.K; 08-18-2013 at 03:22 AM. Reason: Image link changed.
07-12-2013, 02:39 PM   #6
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If you are using Lightroom or Photoshop, you can download the Adobe Lens Profile Creator (it is free) and it has several targets with checker patterns you can print in many sizes.

Not only you can check for distortion, but you can actually create a profile for the lens that Lightroom and PS can use to correct you images for distortion and vignetting.
07-12-2013, 02:51 PM   #7
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QuoteOriginally posted by demp10 Quote
using Lightroom or Photoshop, you can download the Adobe Lens Profile Creator
Good call, I have that, yet it never crossed my mind, I guess not much does these days.
07-12-2013, 03:21 PM   #8
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Some of the sizes




08-29-2013, 11:57 AM   #9
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Sorry for the very late reply, I do like the brick idea, and the adobe grids I can print off.
Here's the link to the Windows Adobe Lens Profile Creator - Adobe - Adobe Lens Profile Creator : For Windows
08-29-2013, 12:15 PM   #10
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Just a point, I use a plug in for lens distortion correction, and they advise against using brick and np block walls as they are not accurate enough. They recommend skyscrapers. If you mail them the shots whey develop the lens corrections
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