TEN-HIGH 20mm ZnSe Focal Lens vs TEN-HIGH 12mm ZnSe CO2 Focal (2026): Key Differences
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This guide compares the ten high 20mm znse focal lens vs 12mm znse co2 focal lens. Both are ZnSe plano-convex lenses for CO2 laser engraving machines. They share high transmittance materials and double-sided solid coatings for durability. The main difference is the focal length. One offers 127mm focus, while the other provides 76.2mm focus. This change affects beam spot size and working distance. You need to know which focal length matches your machine requirements.
Key differences
| Aspect | TEN-HIGH 20mm ZnSe Focal Lens | TEN-HIGH 12mm ZnSe CO2 Focal Lens |
|---|---|---|
| Focal Length | 127mm (5 inches) | 76.2mm (3 inches) |
| Diameter | 20mm (0.79 inches) | 12mm (0.47 inches) |
| Weight | 0.64 ounces | 3.53 ounces |
| Laser Type | CO2 | CO2 |
Which one should you choose?
Choose TEN-HIGH 20mm ZnSe Focal Lens if
- You need a longer working distance for thicker materials.
- Your machine requires a 20mm lens diameter.
- You prefer a lighter lens assembly.
Choose TEN-HIGH 12mm ZnSe CO2 Focal Lens if
- You require a shorter focal length for tighter focus.
- Your machine housing fits a 12mm diameter lens.
- You need a lens that weighs more than 0.64 ounces.
Verdict: The 20mm lens suits systems needing a 127mm focal length and larger diameter. The 12mm lens fits machines designed for a 76.2mm focus and smaller aperture. Choose based on your machine's physical lens holder and desired focal distance.
Focal Length and Diameter Comparison
Focal Length
The focal length determines how tightly the laser beam concentrates. The TEN-HIGH 20mm ZnSe Focal Lens has a focal length of 127mm, which is 5 inches. The TEN-HIGH 12mm ZnSe CO2 Focal Lens has a shorter focal length of 76.2mm, or 3 inches. A shorter focal length generally produces a smaller spot size. This allows for finer detail in engraving tasks. The longer focal length provides a larger depth of focus. This can be useful for engraving on uneven surfaces. You should choose based on whether you prioritize fine detail or surface tolerance.
Lens Diameter
The physical diameter of the lens affects the beam path and compatibility with your machine's optics. The TEN-HIGH 20mm ZnSe Focal Lens features a diameter of 20mm, which equals 0.79 inches. The TEN-HIGH 12mm ZnSe CO2 Focal Lens has a smaller diameter of 12mm, or 0.47 inches. Larger lenses can sometimes handle higher power densities without damage. Smaller lenses fit into tighter optical housings. Ensure your laser tube and mirror assembly match the diameter you select. This is a critical mechanical fit requirement for your specific CO2 laser engraving machine.
Lens Thickness
Both lenses share the same physical thickness specification. The TEN-HIGH 20mm ZnSe Focal Lens is approximately 2.2mm thick, or 0.09 inch. The TEN-HIGH 12mm ZnSe CO2 Focal Lens is also approximately 2.2mm thick, or 0.09 inch. This identical thickness means they likely use similar mounting mechanisms or holders. It simplifies the swap if you need to change focal lengths. The data does not specify any tolerance variations. You can expect consistent physical profiles when installing either lens into your CO2 laser system.
Weight
Weight is important if you are handling the lenses frequently or if the optical assembly is sensitive to mass. The TEN-HIGH 20mm ZnSe Focal Lens weighs 0.64 ounces. The TEN-HIGH 12mm ZnSe CO2 Focal Lens weighs 3.53 ounces. The larger diameter lens is significantly lighter in this specific data set. This may seem counterintuitive, but it depends on the glass volume and density. Heavier lenses require more robust mounting hardware. Lighter lenses are easier to clean and inspect. Check your machine's specifications to ensure the mounting bracket can support the weight difference.
Optical Coating
Both products utilize the same coating technology for durability and performance. The TEN-HIGH 20mm ZnSe Focal Lens features a double-sided solid coating. This provides wiping resistance and a long working life. The TEN-HIGH 12mm ZnSe CO2 Focal Lens also uses a double-sided solid coating with the same wiping resistance and longevity claims. Both lenses are designed to reduce laser loss through high transmittance. This shared feature ensures consistent optical efficiency regardless of which diameter you choose. The coating protects the ZnSe material from damage during routine maintenance.
Which lens suits your specific needs
Users needing wider focal depth
The 20mm lens offers a 127mm focal length. This longer distance provides a greater depth of focus. You get consistent engraving quality across uneven surfaces. The 20mm diameter also allows for a larger beam spot. This setup reduces precision but increases tolerance for material height variations during cutting or engraving tasks.
Users needing finer detail work
The 12mm lens has a 76.2mm focal length. This shorter distance concentrates the laser beam more tightly. You achieve a smaller spot size for sharper details. The 12mm diameter supports this precision. If your work requires intricate patterns or high-resolution text, this tighter focus delivers the necessary clarity and edge definition for your projects.
Users prioritizing lightweight setup
This lens weighs only 0.64 ounces. The lighter mass reduces the load on your laser head. This can help maintain higher acceleration speeds without straining the mechanics. The 20mm diameter and 127mm focal length remain standard. You get the benefit of reduced inertia while keeping the optical performance consistent with other high-transmittance ZnSe components.
The products compared
TEN-HIGH 20mm ZnSe Focal Lens
Best for: CO2 lasers needing 127mm focal length
- Laser Type
- CO2
- Dimensions
- 1.97 × 0.79 × 1.97 inches
- Weight
- 0.64 ounces
View on Amazon: TEN-HIGH 20mm ZnSe Focal Lens Affiliate link
This TEN-HIGH focal lens uses ZnSe material with a 20mm diameter and 127mm focal length. It features double-sided solid coating for wiping resistance and high transmittance to reduce laser loss. The plano-convex shape supports better engraving quality. It weighs 0.64 ounces and fits CO2 laser cutting and engraving machines. This lens suits users needing a standard 5-inch focal length with durable optical coatings.
Pros
- 20mm diameter with 127mm focal length
- ZnSe material with high transmittance
- Double-sided solid coating for durability
- Plano-convex shape for engraving quality
Cons
- 127mm focal length is longer than the 12mm alternative
- 20mm diameter is larger than the 12mm alternative
- No app or remote control support listed
Good fit if
- You need a 127mm focal length for your CO2 laser
- You prefer a 20mm diameter lens for your machine
- You want high transmittance for better efficiency
Skip if
- You require a shorter 12mm focal length
- You need a smaller 12mm diameter lens
- You want app-controlled lens adjustments
Verdict: TEN-HIGH 20mm 127mm ZnSe Lens is a solid choice for CO2 laser users who specifically need a 127mm focal length and 20mm diameter. It offers reliable optical performance through high transmittance and durable coatings.
TEN-HIGH 12mm ZnSe CO2 Focal Lens
Best for: Standard CO2 engraving with 3-inch focal length
- Laser Type
- CO2
- Weight
- 3.53 ounces
View on Amazon: TEN-HIGH 12mm ZnSe CO2 Focal Lens Affiliate link
This TEN-HIGH lens is a 12mm diameter, 3-inch focal length optic for CO2 laser engravers. It uses ZnSe material with double-sided solid coating for high transmittance and reduced laser loss. The plano-convex shape supports better engraving quality. It weighs 3.53 ounces. This lens suits users who need a standard 3-inch focal length for general cutting and engraving tasks on CO2 machines.
Pros
- 12mm diameter with 76.2mm (3 inch) focal length
- ZnSe material with high transmittance
- Double-sided solid coating for wiping resistance
- Plano-convex shape for improved engraving quality
Cons
- Shorter 3-inch focal length limits working distance compared to 5-inch options
- Smaller 12mm diameter restricts beam spread and may require precise alignment
- No included mounting hardware or housing listed
Good fit if
- You need a standard 3-inch focal length for CO2 engraving
- You prefer a compact 12mm lens for precise beam control
- You want high transmittance for efficient laser energy use
Skip if
- You require a longer working distance for thick materials
- You need a larger diameter lens for broader beam coverage
- You are using a laser type other than CO2
Verdict: TEN-HIGH 12mm 3" CO2 ZnSe Lens offers reliable performance for standard CO2 engraving with its high-transmittance ZnSe material and precise 3-inch focal length. It is a solid choice for users who prioritize beam precision and standard focal distances over extended working range.
Specifications side by side
| Spec | TEN-HIGH 20mm ZnSe Focal Lens | TEN-HIGH 12mm ZnSe CO2 Focal Lens |
|---|---|---|
| Laser Type | CO2 | CO2 |
| Dimensions | 1.97 × 0.79 × 1.97 inches | not stated |
| Weight | 0.64 ounces | 3.53 ounces |
| Size | 5"/127mm | 3"/76.2mm |
| Model | ABCD | not stated |
Frequently asked questions
Which lens is better for deep engraving?
The TEN-HIGH 20mm lens is better for deeper engraving. Its 127mm focal length creates a larger depth of focus. This allows the laser to maintain focus over a greater vertical distance. The shorter 76.2mm focal length of the 12mm lens concentrates the beam more tightly but with less depth. Choose the 20mm lens if you are engraving uneven surfaces or need a wider working range.
Does lens diameter affect the laser beam size?
Yes, the diameter influences the beam quality and focus. The 20mm lens has a 20mm diameter, while the 12mm lens has a 12mm diameter. A larger diameter lens can help maintain beam quality at longer focal lengths. The 12mm lens is designed for standard CO2 engraving where precision is prioritized over extended working distance. Select the diameter that matches your machine's lens holder size.
Are both lenses compatible with CO2 lasers?
Both lenses are designed specifically for CO2 lasers. They use ZnSe material, which is standard for transmitting CO2 laser beams. The TEN-HIGH 20mm lens and the 12mm lens both feature high transmittance coatings. This ensures efficient energy transfer from the laser tube to the workpiece. You can use either lens depending on your required focal length and machine specifications.
What is the weight difference between the two lenses?
The TEN-HIGH 20mm lens weighs 0.64 ounces. The TEN-HIGH 12mm lens weighs 3.53 ounces. The 12mm lens is significantly heavier despite its smaller focal length. This difference may matter for machines with delicate lens holders or moving heads. Consider the mounting mechanism of your engraver when choosing between the lighter 20mm option and the heavier 12mm option.
Can I use the 20mm lens for fine detail work?
The 20mm lens is less ideal for ultra-fine detail due to its 127mm focal length. Longer focal lengths produce a larger spot size. The 12mm lens with its 76.2mm focal length concentrates the beam more tightly. This results in finer detail and sharper edges. If your project requires high precision on flat surfaces, the 12mm lens is the more suitable choice for fine engraving tasks.
What material are these lenses made from?
Both lenses are made from Zinc Selenide, or ZnSe. This material is highly transparent to CO2 laser wavelengths. It ensures high transmittance for efficient laser operation. Both lenses also feature double-sided solid coatings for durability. This coating protects the optical surface from damage and maintains performance over time. ZnSe is the standard material for CO2 laser optics.
Which lens fits standard CO2 engraving machines?
The TEN-HIGH 12mm lens is described as suitable for standard CO2 engraving. Its 76.2mm focal length is a common standard for many desktop engravers. The 20mm lens is best for users needing a specific 127mm focal length. Check your machine's manual for the required focal length. Most standard machines use the shorter 3-inch focal length, making the 12mm lens the typical choice for general use.