# .cor files and needing more resolution for non-linear lens distortion

**URL:** <https://forum.lightburnsoftware.com/t/cor-files-and-needing-more-resolution-for-non-linear-lens-distortion/189590>\
**Category:** LightBurn Software Questions\
**Tags:** ezcad2, 25-point-corfile\
**Created:** [May 8, 2026, 2:34am UTC](https://forum.lightburnsoftware.com/t/cor-files-and-needing-more-resolution-for-non-linear-lens-distortion/189590 "2026-05-08T02:34:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![AgentMulder](https://forum.lightburnsoftware.com/letter_avatar_proxy/v4/letter/a/e495f1/32.png) [@AgentMulder](https://forum.lightburnsoftware.com/u/AgentMulder)\
**Post date:** [May 8, 2026, 2:34am UTC](https://forum.lightburnsoftware.com/t/cor-files-and-needing-more-resolution-for-non-linear-lens-distortion/189590/1 "2026-05-08T02:34:04Z")

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Hello all,

I am trying to calibrate an F420/F429 lens for a 300 × 300 mm field.

I can get the field square in either LightBurn or EZCAD2/CorFile2, but I cannot get scaling to stay consistent across the whole field. If I scale so that a 100 mm square is correct, then a 280 mm square can be oversized by about 4 mm. If I scale for the 280 mm square, then the 100 mm square ends up too small. Issue is that I need sub-millimeter accuracy across the full field.

I had heard CorFile2 could do denser correction than the normal 9-point workflow, but I only see 9x9 and am only getting the same kind of result as LightBurn. CorFile2 does appear to have a ‘multi-points param’ section with grids up to about 65 × 65, which I can etch, but I cannot find any documentation on how that part is actually used. Like what next? What do I measure, and where do i enter that?

**Has anyone here successfully used multi-point correction in CorFile2 as resolutions higher than 9x9?** Is there a documented workflow for generating a denser .cor file?

More on topic here: **is LightBurn likely to support higher-resolution field correction for large lenses like this?**

Any insight appreciated.

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<div class="post-metadata">

**Author:** ![AgentMulder](https://forum.lightburnsoftware.com/letter_avatar_proxy/v4/letter/a/e495f1/32.png) [@AgentMulder](https://forum.lightburnsoftware.com/u/AgentMulder)\
**Post date:** [May 10, 2026, 7:32am UTC](https://forum.lightburnsoftware.com/t/cor-files-and-needing-more-resolution-for-non-linear-lens-distortion/189590/2 "2026-05-10T07:32:33Z")

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oops, I mean 3x3, **9-point.** Not 9x9

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**Author:** ![system](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/system/32/64335_2.png) [@system](https://forum.lightburnsoftware.com/u/system)\
**Post date:** [June 9, 2026, 7:33am UTC](https://forum.lightburnsoftware.com/t/cor-files-and-needing-more-resolution-for-non-linear-lens-distortion/189590/3 "2026-06-09T07:33:08Z")

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Closed on June 9, 2026, 7:33am UTC

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