---
product_id: 376695728
title: "OMTech F Theta Lens for Fiber Laser Engravers, 300x300mm Replacement Optical Scanning Lens for 1064nm Fiber Cutter Marking Engraving Machines, Laser Etching Accessory Field Lens Upgrade, M85x1 Thread"
brand: "omtech"
price: "992 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/376695728-omtech-f-theta-lens-for-fiber-laser-engravers-300x300mm-replacement
store_origin: RO
region: Romania
---

# 99% light throughput 300x300mm scanning area M85x1 easy install OMTech F Theta Lens for Fiber Laser Engravers, 300x300mm Replacement Optical Scanning Lens for 1064nm Fiber Cutter Marking Engraving Machines, Laser Etching Accessory Field Lens Upgrade, M85x1 Thread

**Brand:** omtech
**Price:** 992 Lei
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade Your Laser Game!

## Quick Answers

- **What is this?** OMTech F Theta Lens for Fiber Laser Engravers, 300x300mm Replacement Optical Scanning Lens for 1064nm Fiber Cutter Marking Engraving Machines, Laser Etching Accessory Field Lens Upgrade, M85x1 Thread by omtech
- **How much does it cost?** 992 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/376695728-omtech-f-theta-lens-for-fiber-laser-engravers-300x300mm-replacement)

## Best For

- omtech enthusiasts

## Why This Product

- Trusted omtech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Design:** Enjoy long-lasting use with scratch-resistant coatings.
- • **High Throughput:** Achieve up to 99% light transmission for vibrant results.
- • **Wide Application:** Perfect for marking on metals like steel, aluminum, and gold.
- • **Precision Performance:** Experience flawless engraving with a 20 micron spot size.
- • **Versatile Compatibility:** Easily upgrade your setup with standard M85x1 threading.

## Overview

The OMTechF Theta Lens is a high-performance optical scanning lens designed for 1064nm fiber laser engravers. With a generous 300x300mm scanning area and exceptional 99% light throughput, this lens ensures precise and vibrant markings on various materials. Its durable, scratch-resistant design and easy M85x1 installation make it a must-have accessory for any laser engraving setup.

## Description

OMTech F Theta Lens for Fiber Laser Engravers, 300x300mm Replacement Optical Scanning Lens for 1064nm Fiber Cutter Marking Engraving Machines, Laser Etching Accessory Field Lens Upgrade, M85x1 Thread

## Features

- 300x300mm FIELD LENS: OMTech’s F-Theta lens is ideal for laser marking, engraving, image transfer, material processing, and cutting systems; it creates vivid markings and flawlessly completes even your most intricate designs through its 11.9x11.9 inch scanning area
- HIGH TRANSMITTANCE: This field lens for 1064 nm lasers up to 60W provides up to 99% throughput with negligible distortion thanks to its crystal clear and precision engineered borosilicate crown glass construction
- SUPERIOR PERFORMANCE: Our F-theta scanning lens provides fast positioning and precision focusing so you can mark steel, aluminum, gold, silver, and more with a consistently exact 20 micron spot size anywhere in the lens's 30x30 cm field
- LASTING DURABILITY: The fiber laser lens's double-sided multilayered coatings improve natural optical properties and ensure outstanding scratch and damage resistance during daily use, for a long service life and reliable performance
- EASY INSTALLATION: The standard M85x1 threading offers easy installation, quickly replacing or upgrading the old lens in OMTech or most other laser marking machines on the market

## Images

![OMTech F Theta Lens for Fiber Laser Engravers, 300x300mm Replacement Optical Scanning Lens for 1064nm Fiber Cutter Marking Engraving Machines, Laser Etching Accessory Field Lens Upgrade, M85x1 Thread - Image 1](https://m.media-amazon.com/images/I/61Ej1i4lh9L.jpg)

## Questions & Answers

**Q: Can these lenses be used on a UV laser marker?**
A: Sorry no.

**Q: Is this quartz? What wattage can this lens handle?**
A: A lense is not rated by wattage, make no difference if crystal or other rare mineral. The wavelength, 1064nm in this case, and the thread of your Laser's lense input is what determines the compatibility. 
Despite the popular belief that a shorter focus distance could increase the laser's power, it does not, a complete bogus theory. The laser module regulates the power. The focal distance only changes the working area, nothing else. This could be set to use on a 20W Laser or 100W Laser.

If you need a smaller area for whatever ergo reason, a new shorter focus lense is the way to go. Other than that, stay with your existing lense your machine came with.

I bought this new lense thinking to make a difference with the shorter focus hoping to increase sharpness but should have researched it. Now you have my research.

**Q: I'm changing from a 300mm lens to this 175mm lens, are there different parameters for lightburn and where would I find them?**
A: I use Lightburn and no, there are no parameters in the software for the lense. 

Lightburn only sets the power output. The lense focal distance regulates the working area only, no additional benefits unless for some reason you need to have a smaller working area. The focus is set manually by moving your Laser's arm and experimenting with the distance that produces most sparks while engraving, that's it

**Q: Will it fit a wisley fiber laser?**
A: The thread of this product is standard M85x1. If the thread maches, then it can fit.

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-02*