Omegon Plössl 9mm 50° 1.25″ Illuminated Reticle Eyepiece
Accurate guiding in astrophotography depends entirely on how well you can track a guide star. This illuminated double-crosshair reticle eyepiece is designed exactly for that purpose - whether you are using an off-axis guider or a dedicated guide telescope. Instead of a single crosshair that simply covers the star, the double crosshair lets you centre the star precisely between the lines. Any drift becomes immediately visible, so you can correct it before it affects your image.
Adjustable crosshair for off-axis guiders
When using an off-axis guider, the field of view is limited and the guide star is often not at the centre - it sits somewhere near the edge. That is exactly why the ability to shift the crosshair in any direction is so important. You do not need to rearrange your setup - just fine-tune the position of the crosshair. Smooth and precise crosshair adjustment makes this process much easier.
Sharp crosshair for any eyesight
The eyepiece includes a dioptre adjustment lens so you can focus the crosshair to suit your own eyesight. The crosshair stays sharp whether or not you wear corrective glasses. Power is supplied by two LR44 batteries, which are not included.
4-element Plössl optics with multi-coated lenses
The four-element Plössl design delivers a clear, sharp image with a 50° apparent field of view. Multi-layer anti-reflection coatings increase light transmission, so the eyepiece works well even with faint guide stars that would otherwise be at the limit of usability. The 9 mm focal length provides high magnification, which helps you react quickly to any tracking error.
More than just guiding
This eyepiece for precise astrophotography guiding is also useful outside of an imaging session. It is a practical tool for measuring fields of view, for accurate polar alignment, and for determining the position angles of double stars. Once you have it, you will reach for it again and again.
Key features
- Illuminated double crosshair for precise guide star centring
- Adjustable crosshair position - ideal for off-axis guiders
- Dioptre adjustment for individual eyesight correction
- 4-element Plössl optics with multi-layer anti-reflection coatings
- 50° apparent field of view
- 9 mm focal length for high magnification
- 1.25″ barrel diameter - fits most focusers and guiders
- Powered by two LR44 batteries (not included)
Technical specifications
| Parameter |
Value |
| Eyepiece type |
Plössl with illuminated reticle |
| Focal length |
9 mm |
| Apparent field of view |
50° |
| Barrel diameter |
1.25″ |
| Optical design |
4-element Plössl |
| Coatings |
Multi-layer anti-reflection coatings |
| Reticle type |
Illuminated double crosshair, adjustable position |
| Dioptre adjustment |
Yes |
| Power supply |
2 x LR44 (not included) |
Who is this eyepiece for?
This eyepiece suits anyone who guides their astrophotography sessions manually or with basic automation. It works equally well for beginners taking their first steps in guided imaging and for experienced observers who need a reliable reticle eyepiece for polar alignment or double star work. If you use an off-axis guider or a guide telescope, this is a practical and affordable tool that earns its place in your kit.
