TS Optics 2.5x APO 1.25″ Barlow Lens
Premium Apochromatic Performance in a Compact Design
The TS Optics 2.5x APO Barlow lens is a high-quality optical accessory built for serious visual observation and astrophotography. Its three-element apochromatic design delivers image quality comparable to a dedicated eyepiece of the equivalent focal length - with virtually no loss of sharpness or clarity. This makes it an excellent choice for observers who refuse to compromise on optical performance.
The lens is designed to work with almost any telescope on the market. Its short physical length is a real advantage - in most cases it will not clash with the mirror or prism inside a star diagonal. This is especially useful with refractors and reflectors of different designs, where the length of accessories can make a significant difference.
Optical Quality
The three-element apochromatic construction uses an air-spaced design between the optical elements. This helps to minimise chromatic aberration and delivers high image contrast. All optical surfaces carry Fully Multi-Coated (FMC) anti-reflection coatings, which maximise light transmission and produce a bright, crisp image. The edges of the lens elements are blackened to suppress unwanted internal reflections and scattered light that would otherwise reduce image quality.
Solid Build Quality
The body of the Barlow lens is made entirely from metal, ensuring long-term durability and mechanical strength even with heavy use in the field. Eyepieces and other accessories are secured using a precision brass compression ring. This holds everything firmly in place without scratching the barrel of your eyepiece - widely regarded as the gentlest and most reliable clamping method available.
Technical Specifications
| Parameter |
Value |
| Magnification factor |
2.5x |
| Optical design |
3-element apochromatic (APO), air-spaced |
| Barrel diameter |
1.25″ |
| Lens coatings |
FMC (Fully Multi-Coated) |
| Lens edge treatment |
Blackened |
| Body material |
Full metal |
| Clamping system |
Brass compression ring |
| Compatibility |
Universal - fits all 1.25″ focusers |
Who Is This Barlow Lens For?
The TS Optics 2.5x APO suits both beginners and experienced astronomers. If you are just starting out, this lens effectively doubles the range of magnifications you can achieve with your existing eyepieces - without buying new ones. If you are an advanced observer or astrophotographer, the apochromatic design ensures outstanding sharpness and colour accuracy even at high magnification.
Investing in a quality Barlow lens is one of the most cost-effective ways to expand and improve your optical system. You get more from every eyepiece you already own.
About TS Optics
TS Optics, also known as Teleskop Service, is a German company with a long-standing reputation in the design and distribution of astronomical optics and accessories. The brand is popular among astronomers for its focus on quality, precise manufacturing, and strong value for money. All TS Optics products go through thorough quality control and are developed with the real needs of astronomers in mind - from beginners to professionals. The range includes telescopes, eyepieces, Barlow lenses, filters, mounts, and a wide selection of accessories for both visual use and astrophotography.
Key Benefits at a Glance
- 3-element apochromatic design - minimal chromatic aberration
- Air-spaced optical elements for high contrast
- FMC coatings on all surfaces for maximum light transmission
- Short body length - compatible with star diagonals
- Brass compression ring - secure grip, no scratches on eyepiece barrels
- Full metal construction for long-term durability
- Universal 1.25″ fit - works with almost any telescope
- Suitable for both visual observation and astrophotography
