TS Optics Premium Flat Field 15.5mm 65° 1.25″ Eyepiece
A Premium Wide-Field Eyepiece for Every Observer
The TS Optics Premium Flat Field eyepiece with a 15.5mm focal length and a 65° apparent field of view is an excellent choice for astronomers at every level. Its optical design uses five lenses in three groups, delivering outstanding flat-field correction and high light transmission. This means you can make full use of your telescope's focal ratio without wasting a single photon.
The 17.4mm barrel diameter and the 65° field of view give you a wide, comfortable window onto the night sky. A rubber eye cup keeps your eye correctly positioned and makes longer observing sessions far more comfortable.
Comfort for Spectacle Wearers
The 16mm eye relief is generous enough for observers who wear glasses. You can see the entire field of view without removing your spectacles - no clipping, no dark edges, just a clean, full image.
Inside the barrel, high-quality blackening suppresses stray reflections and keeps contrast high. This flat-field premium eyepiece maintains excellent correction even with fast optical systems at low focal ratios, where many cheaper eyepieces struggle to keep stars sharp across the whole field.
What Can You Observe?
Deep-Sky Objects
When you point your telescope at galaxies, nebulae, or star clusters, the high light transmission of this eyepiece lets you use the full light-gathering power of your telescope. Faint details that a lesser eyepiece might wash out become visible and distinct.
Moon and Planets
The precise internal blackening delivers strong contrast and sharp rendering of surface details on the Moon and planets. Craters, mountain ranges, and planetary cloud belts all benefit from the clean, high-contrast image this eyepiece produces.
Double Stars
The flat, well-corrected field makes this eyepiece a reliable choice for splitting double stars, including close pairs near the resolution limit of your telescope.
More Ways to Use This Eyepiece
The comfortable, wide field makes this eyepiece a natural fit for binocular observing with a dual-telescope setup or in a binocular finderscope. Its compact dimensions and narrow barrel profile also allow use with eyepiece projection adapters for astrophotography - capturing detailed images of the lunar surface or planetary discs.
Whether you are a beginner buying your first quality eyepiece or an experienced astronomer building a collection of premium eyepieces for different magnifications, this model delivers.
Built to Last in the Field
At just 82g and 61mm in total length, this eyepiece is light and compact enough to carry to any dark-sky site without adding bulk to your kit bag. The build quality is solid and consistent - reliable whether you are observing from a garden or a remote hillside.
About TS Optics
TS Optics is a respected European brand focused on the development and manufacture of astronomical optics and accessories. Astronomers around the world choose TS Optics for their commitment to build quality, optical precision, and honest pricing. The Premium Flat Field eyepiece range was designed to give observers an accessible yet high-performing option - one that holds up in demanding conditions and works well with all types of telescopes.
Technical Specifications
| Parameter |
Value |
| Focal length |
15.5mm |
| Apparent field of view |
65° |
| Barrel diameter |
1.25″ (31.75mm) |
| Barrel width |
17.4mm |
| Eye relief |
16mm |
| Optical design |
5 lenses in 3 groups |
| Total length |
61mm |
| Weight |
82g |
| Eye cup |
Rubber, fold-down |
| Internal finish |
Blackened barrel to reduce stray light |
