Omegon OGDO 4 mm eyepiece 80° (1.25 and 2 inch): lanthanum ED optics with 80 degree field of view
The Omegon OGDO 4 mm is the top-of-the-line model among Omegon eyepieces: lanthanum ED glass from the Japanese Ohara, a field of view of 80 degrees and stars that remain point-shaped to the edge.
The all-metal housing is waterproof and dustproof, with a rotating eyepiece and 20mm eye relief. A flannel storage bag and two protective caps are included.
Lanthaan-ED glass from Ohara
The heart of the OGDO series is lanthanum-holding ED glass from Japanese glass manufacturer Ohara. Color aberrations are minimized, and the image remains sharp to the edge of the wide field, even with fast telescopes down to f/4.5.
For very fast Newtonians around f/4.5 and faster, the manufacturer recommends a coma corrector to keep the outer edges sharp as well; that's a characteristic of the telescope, not the eyepiece.
80 degrees with 20 mm eye relief
The combination of an ultra-wide field of view and generous eye relief is rare: eyeglass wearers can see the full 80-degree field of view without taking off their glasses. The rotating eyecup can be continuously adjusted to your personal viewing distance.
Metal casing, ready for any night
Water and dust proof: dew and temperature changes won't affect the optics. This is an eyepiece built to last for years.
What do you see with 4 mm?
On a 200/1200 Dobson, 4 mm gives a magnification of 300x: only useful in calm air and with sufficient aperture (maximum 2x the aperture in millimeters). On a 100/580 refractor, 145x is actually a daily working magnification.
Nice lunar structure, the Cassini division and close binary stars, floating in an 80 degree field.
Included
- Omegon OGDO 4 mm eyepiece
- Flannel storage bag
- Lens and eyepiece covers
Featured accessories
The OGDO series ranges from 4 to 20 mm with the same field of view and eye relief. The OGDO eyecup set M50 is the matching replacement and comfort accessory.
For whom yes and for whom no
- ✓ Demanding observers who want top-level edge sharpness and color purity
- ✓ Spectacle wearers: the full 80-degree field of view remains visible thanks to a 20 mm eye relief
- ✓ Owners of fast telescopes from f/4.5
- ✗ Those looking for a light eyepiece for a small table-top telescope: these are sturdy metal eyepieces
Specifications
| Focal length | 4 mm |
| Apparent field of view | 80 degrees |
| Eye relief | 20 mm |
| Optical design | Lanthanum-ED-Glass (Ohara), multilayer coated |
| Housing | full metal, waterproof, and dustproof |
| Mount | 1.25 and 2 inch, with filter thread |
| Eyecup | swivel adjustable |
| Series | Omegon OGDO 80° |
You can find more accessories for this brand at the Omegon brand page.
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