# Which lens to use

**URL:** <https://forum.lightburnsoftware.com/t/which-lens-to-use/19758>\
**Category:** Community Laser Talk\
**Created:** [August 1, 2020, 12:05am UTC](https://forum.lightburnsoftware.com/t/which-lens-to-use/19758 "2020-08-01T00:05:22Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Stroonzo](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/stroonzo/32/8293_2.png) [@Stroonzo](https://forum.lightburnsoftware.com/u/Stroonzo)\
**Post date:** [August 1, 2020, 2:05am UTC](https://forum.lightburnsoftware.com/t/which-lens-to-use/19758/6 "2020-08-01T02:05:10Z")

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> [@Problems with Baltic Birch Plywood](https://forum.lightburnsoftware.com/t/problems-with-baltic-birch-plywood/13617/16):
>
> Here is a good write up about the tolerances on focal length: [https://buildyourcnc.com/tutorials/tutorial-CO2-Laser-Optics-Lens-Selection-Focal-length](https://buildyourcnc.com/tutorials/tutorial-CO2-Laser-Optics-Lens-Selection-Focal-length) And another good read here:

As seen on [https://lasergods.com/laser-lenses-optics-and-focus/](https://lasergods.com/laser-lenses-optics-and-focus/)

[![](https://lasergods.com/wp-content/uploads/2018/07/beam-diagram.jpg) ](https://lasergods.com/wp-content/uploads/2018/07/beam-diagram.jpg)

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