# Received My order but lacking some instruction

**URL:** <https://forum.cloudray.com/t/received-my-order-but-lacking-some-instruction/574>\
**Category:** CO2 Lens\
**Created:** [October 14, 2021, 12:05am UTC](https://forum.cloudray.com/t/received-my-order-but-lacking-some-instruction/574 "2021-10-14T00:05:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![norm258](https://avatars.discourse-cdn.com/v4/letter/n/eada6e/32.png) [@norm258](https://forum.cloudray.com/u/norm258)\
**Post date:** [October 14, 2021, 12:05am UTC](https://forum.cloudray.com/t/received-my-order-but-lacking-some-instruction/574/1 "2021-10-14T00:05:32Z")

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I received my compound lens for engraving. Along with it I received the auto-focus K-series lens holder.  
Can I insert this compound lens into it and if so, focus length from the tip would be what?

Thanks in advance.

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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:** [October 14, 2021, 1:19am UTC](https://forum.cloudray.com/t/received-my-order-but-lacking-some-instruction/574/2 "2021-10-14T01:19:50Z")

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Hello,norm258.Compound lenses are generally suitable for C series and E series, but it cannot be used for K series.