# Only the mixed cutting head does not have the mixed cutting suit. Now you need a focusing lens. The focal length on the detail page is 63.5-101.6mm, while the focal length on the mixed cut package is 63.5mm. How to choose

**URL:** <https://forum.cloudray.com/t/only-the-mixed-cutting-head-does-not-have-the-mixed-cutting-suit-now-you-need-a-focusing-lens-the-focal-length-on-the-detail-page-is-63-5-101-6mm-while-the-focal-length-on-the-mixed-cut-package-is-63-5mm-how-to-choose/309>\
**Category:** Laser Head\
**Created:** [April 21, 2021, 2:12am UTC](https://forum.cloudray.com/t/only-the-mixed-cutting-head-does-not-have-the-mixed-cutting-suit-now-you-need-a-focusing-lens-the-focal-length-on-the-detail-page-is-63-5-101-6mm-while-the-focal-length-on-the-mixed-cut-package-is-63-5mm-how-to-choose/309 "2021-04-21T02:12:04Z")\
**Posts on this page:** 1\
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**Author:** ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)\
**Post date:** [April 21, 2021, 2:12am UTC](https://forum.cloudray.com/t/only-the-mixed-cutting-head-does-not-have-the-mixed-cutting-suit-now-you-need-a-focusing-lens-the-focal-length-on-the-detail-page-is-63-5-101-6mm-while-the-focal-length-on-the-mixed-cut-package-is-63-5mm-how-to-choose/309/1 "2021-04-21T02:12:04Z")

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![image](https://us1.discourse-cdn.com/flex020/uploads/cloudray/original/1X/4722804b06fe21a035a6f1314cda018ccd1251f1.png)  
Non-metal is carbon dioxide cutting, metal is fiber cutting, the corresponding focusing lens is 10.6 and 1064; short focal length is used for cutting metal, long focal length is suitable for cutting thick non-metal.