Best Co2 Laser Lens Under $30 (2026)
Five ZnSe focus lenses for CO2 laser engravers compared by diameter, focal length, transmittance and stated power range.
On this page
Top picks at a glance
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- 1
Best OverallDGHUNST 20mm Lens9.5/10View on Amazon - 2
Best 20mmCloudray 20mm Lens9.5/10View on Amazon - 3Best 18mmCloudray 18mm Lens9.4/10View on Amazon
- 4
Short Focus PickCNCOLETECH 18mm Lens9.4/10View on Amazon - 5
Value PickTEN-HIGH 20mm Lens9.4/10View on Amazon - 620mm CO2 Laser LensView on Amazon
- 7
CO2 Laser Lens 18mm Laser Mirror CO2 Laser Focal Lens CO2View on Amazon - 8
MCWlaser CO2 PVD ZnSe Laser Lens Focal Focus Lens Dia: 18mmView on Amazon - 9D18mm FL50.8mm CO2 Laser LensView on Amazon
- 10Cloudray 20mm CO2 Laser LensView on Amazon
A hazy cut line and scorched edges usually mean the focus lens, not the tube. Swapping in a fresh lens is the simplest fix on a CO2 laser, and the best co2 laser lens under 30 covers the sizes most small machines use. This guide compares five ZnSe lenses by diameter, focal length, transmittance and stated power range, using only what each listing publishes.
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Quick picks
- Best Overall DGHUNST 20mm Lens: 99.9% transmittance, up to 180W, 20mm with 63.5mm focal length. Check price on Amazon
- Best 20mm Cloudray 20mm Lens: Meniscus PVD ZnSe, 63.5mm focal length, 99.5% transmittance. Check price on Amazon
- Best 18mm Cloudray 18mm Lens: Meniscus PVD ZnSe, 63.5mm focal length, 99.5% transmittance. Check price on Amazon
- Short Focus Pick CNCOLETECH 18mm Lens: 18mm lens with 50.8mm focal length for a tight spot. Check price on Amazon
- Value Pick TEN-HIGH 20mm Lens: 20mm meniscus lens, 50.8mm focal length, 99.5% transmittance. Check price on Amazon
Machines on the list
20mm Laser Lens FL 63.5mm/ 2.5" Co2 ZnSe Focus
A 20mm ZnSe focus lens with 63.5mm focal length, 99.9% transmittance and stated resistance up to 180W.
Pros
- 99.9% transmittance, the highest stated here
- Stated resistance up to 180W CO2
- 20mm diameter with 63.5mm focal length
- Double-sided antireflective coating stated
Cons
- No warranty term is stated
- No safety listing stated
- Thicker 2.2-3mm profile
- No meniscus shape stated
20mm CO2 Laser Lens, PVD ZnSe Dia 20mm FL63.5mm
A 20mm PVD ZnSe meniscus lens with 63.5mm focal length and 99.5% transmittance for 30W-100W machines.
Pros
- Meniscus shape stated
- PVD ZnSe with double-sided solid coating
- 99.5% transmittance stated
- Wiping resistance and long working life stated
Cons
- No warranty term is stated
- No safety listing stated
- 30W-100W range only
- Single lens per pack
CO2 Laser Lens 18mm Laser Mirror CO2 Laser Focal
An 18mm PVD ZnSe meniscus lens with 63.5mm focal length and 99.5% transmittance for 30W-100W machines.
Pros
- Meniscus shape stated
- PVD ZnSe with double-sided solid coating
- 99.5% transmittance stated
- Wiping resistance and long working life stated
Cons
- No warranty term is stated
- No safety listing stated
- 18mm fits fewer holders
- 30W-100W range only
CO2 Laser Lens 18mm Mirror Focus Lens PVD ZnSe FL
An 18mm PVD ZnSe lens with 50.8mm focal length and 99.5% transmittance for 30W-100W machines.
Pros
- 50.8mm focal length for a tight spot
- PVD ZnSe with double-sided solid coating
- 99.5% transmittance stated
- High temperature resistance stated
Cons
- No warranty term is stated
- No safety listing stated
- No meniscus shape stated
- 30W-100W range only
TEN-HIGH CO2 Laser Lens 20mm 2"
A 20mm PVD ZnSe meniscus lens with 50.8mm focal length and 99.5% transmittance.
Pros
- Meniscus shape stated
- 50.8mm focal length
- 99.5% transmittance stated
- Double-sided solid coating stated
Cons
- Spec table lists 30W-400W while bullets state 30W-100W
- No warranty term is stated
- No safety listing stated
- Wavelength stated only in the spec table
Other machines to compare
20mm CO2 Laser LensCheck price on Amazon
CO2 Laser Lens 18mm Laser Mirror CO2 Laser Focal Lens CO2Check price on Amazon
MCWlaser CO2 PVD ZnSe Laser Lens Focal Focus Lens Dia: 18mmCheck price on Amazon
D18mm FL50.8mm CO2 Laser LensCheck price on Amazon- Cloudray 20mm CO2 Laser LensCheck price on Amazon
Specs compared
| Lens | HQ Score | Diameter | Focal length | Transmittance | Power range |
|---|---|---|---|---|---|
| DGHUNST 20mm Lens | 9.5/10 | 20mm | 63.5mm | 99.9% | Up to 180W |
| Cloudray 20mm Lens | 9.5/10 | 20mm | 63.5mm | 99.5% | 30W-100W |
| Cloudray 18mm Lens | 9.4/10 | 18mm | 63.5mm | 99.5% | 30W-100W |
| CNCOLETECH 18mm Lens | 9.4/10 | 18mm | 50.8mm | 99.5% | 30W-100W |
| TEN-HIGH 20mm Lens | 9.4/10 | 20mm | 50.8mm | 99.5% | 30W-100W |
23 October 2026
What the lens listings tell you
All five list ZnSe with 99.5% transmittance or better. Diameters are 18mm or 20mm, focal lengths 50.8mm or 63.5mm, and stated power ranges run 30W to 180W. None states a warranty term or a safety listing.
Buying guide: the best co2 laser lens under 30
Diameter: 18mm or 20mm
The lens must match the holder: two picks are 18mm, three are 20mm. Measure the old lens before ordering; the listings state 18mm or 20mm with 0.71 or 0.79 inch equivalents.
Focal length
Focal lengths here are 50.8mm or 63.5mm, stated as 2 or 2.5 inches. The CNCOLETECH and TEN-HIGH use 50.8mm; the other three use 63.5mm. See the best co2 laser lens guide for the full-size picks.
Transmittance and power
Four listings state 99.5% transmittance; the DGHUNST states 99.9% with 10% higher work efficiency claimed. Stated power ranges run 30W to 100W except the DGHUNST at up to 180W. Match the range to the machine, and pair the lens with a water pump for co2 laser cooling loop.
Handle lenses by the edges; the listings state wiping-resistant coatings. Never look into the beam path, and keep the machine lid interlocks working.
Project Match
| Lens holder | Picks |
|---|---|
| 18mm | Cloudray 18mm (63.5mm focus), CNCOLETECH 18mm (50.8mm focus) |
| 20mm | Cloudray 20mm, TEN-HIGH 20mm, DGHUNST 20mm (63.5mm or 50.8mm focus) |
How the scores add up
Each lens is scored on performance, build, value, safety and warranty, with the weights published on the How We Pick page. For lenses, safety points need a stated listing such as a laser class or compliance mark; none of these listings states one, and none states a warranty term.
| Product | HQ Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| DGHUNST 20mm Lens | 9.5 | 32 | 20 | 21 | 0 | 0 |
| Cloudray 20mm Lens | 9.5 | 29 | 21 | 20 | 0 | 0 |
| Cloudray 18mm Lens | 9.4 | 29 | 21 | 19 | 0 | 0 |
| CNCOLETECH 18mm Lens | 9.4 | 28 | 20 | 20 | 0 | 0 |
| TEN-HIGH 20mm Lens | 9.4 | 27 | 19 | 20 | 0 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
FAQ: lasers and CNC
What size lens does my CO2 laser take?
The picks cover 18mm and 20mm diameters. Check the lens holder on the machine; the listings state 18mm or 20mm with 50.8mm or 63.5mm focal lengths.
What does 99.5% transmittance mean?
Four listings state transmittance of 99.5% or better with double-sided coatings; the DGHUNST states 99.9% with 10% higher work efficiency claimed.
Will these lenses fit a 100W CO2 laser?
Four listings state 30W-100W compatibility; the DGHUNST states up to 180W. Match the listing’s stated range to the machine.
Do I need to replace the lens or just clean it?
The listings state wiping-resistant coatings. If cleaning no longer restores the cut, a fresh lens is the next step.
