Omegon OGDO Eyepiece 4mm 80° - Dive into the sky at maximum magnification
The Omegon OGDO 4mm eyepiece is made for those who want to see real detail. Its short focal length gets high magnifications out of your telescope, while the wide 80° field of view keeps the image surprisingly wide and comfortable. Ideal for observing fine structures on planets and the moon, without the “tube feel” of classic high-power eyepieces.
Sharp, contrasty and true to nature
Thanks to lanthanum ED glass from Ohara (Japan), this eyepiece delivers an exceptionally clean image. Color aberrations are greatly reduced and details remain sharp even toward the edge of the field of view. Planetary structures, moon craters and double stars come into focus clearly and steadily.

High comfort even at high magnification
With a generous eye relief of 20 mm, your viewing is relaxed, even with glasses. The rotating eyecup makes it easy to adjust the view perfectly. This keeps observing comfortable, even during longer observation sessions at high magnification.
Built for intensive use
The all-metal housing feels solid and is waterproof and dustproof. This eyepiece is designed for real observing nights in changing conditions. Dew stains, dust or temperature variations are not a problem - you can rely on the OGDO eyepiece to keep performing.

Versatile and flexible
The OGDO 4mm eyepiece works very well with telescopes from f/4.5 up. For very fast systems, a coma corrector can help maintain maximum sharpness even at the edge. Thanks to the combination of 1.25″ AND 2″ connection, this eyepiece can be used flexibly on almost any telescope setup.
What we recommend
✓ Moon: excellent - high magnification with lots of detail
✓ Planets: excellent - sharp and high-contrast image
✓ Double stars: very suitable - accurate separation
✗ Deep-sky: limited suitability - especially for compact objects
✗ Astrophotography: not suitable
Specifications
Capacity
| Feature | Description |
|---|---|
| Focal length (mm) | 4 |
| Field of view (°) | 80 |
| Eye relief (mm) | 20 |
| Number of lenses | 8 |
| Number of groups | 4 |
| Telescope connection | 1,25″ & 2″ |
| Optics coating | FMC |
Details
| Feature | Description |
|---|---|
| Adjustable eye cup | Yes (rotatable) |
| Filter thread | Yes |
| Waterproof | Yes |
| Inert gas charge | No |
Equipment
| Feature | Description |
|---|---|
| Transport bag | Yes |
General
| Feature | Description |
|---|---|
| Series | OGDO |
| Type | Ocular |
| Design | UWA |
| Color | Black |
| Diameter (mm) | 60,1 |
| Height (mm) | 162,8 |
| Weight (g) | 570 |





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