# Huge different result for the optical test

**URL:** <https://forum.formlabs.com/t/huge-different-result-for-the-optical-test/25133>\
**Category:** Form 2\
**Created:** [October 26, 2019, 1:37am UTC](https://forum.formlabs.com/t/huge-different-result-for-the-optical-test/25133 "2019-10-26T01:37:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ctmanhk](https://avatars.discourse-cdn.com/v4/letter/c/db5fbb/32.png) [@ctmanhk](https://forum.formlabs.com/u/ctmanhk)\
**Post date:** [October 26, 2019, 1:37am UTC](https://forum.formlabs.com/t/huge-different-result-for-the-optical-test/25133/1 "2019-10-26T01:37:14Z")

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Hi everyone,  
Do any one know why are so different for the optical test with different resin and tank?

The upper one (failed one)  
are print with new lt tank and clear v2 resin.

The bottom one  
are print with self coat pdms tank and grey v4 resin.

Many thanks

 ![IMG_20191026_093633](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/2/21ae09a6a4cc95eaa48f1cf9e3815ae60089fb8e.jpg)

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**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\
**Post date:** [November 2, 2019, 1:37am UTC](https://forum.formlabs.com/t/huge-different-result-for-the-optical-test/25133/2 "2019-11-02T01:37:20Z")

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