Houdini 1.25” and 2” Coma-Correcting Eyepiece Starter Set (7, 12 & 20mm)
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Set of three coma-correcting eyepieces; the perfect starter package for any Newtonian telescope owner. This set contains the three most used focal lengths. Check out their individual specifications here:
- Coma-Correcting Optics: Built-in correction delivers sharp, pinpoint stars all the way to the edge of its ultra-wide 86° field, especially in Newtonian telescopes.
- Ultra-Wide 86° Apparent Field: Provides an immersive, space-walk viewing experience with expansive views ideal for deep-sky observing.
- Glow-in-the-Dark Focal Length Marking: The illuminated marking makes it easy to identify the eyepiece at night without ruining your dark adaptation.
- Broad Telescope Compatibility: Works best with Newtonians and slower f/6+ telescopes, while avoiding fast refractors and coma-free designs where correction isn’t needed
Houdini Eyepiece Performance
The following graph illustrates the performance of the Houdini eyepieces in a F/4 Newtonian telescope. Spot diagrams with 3,000 rays are shown at the center, halfway, and near the edge of the field.
The spots have been strongly magnified to show them clearly. In the center of the field a spot diagram smaller than 2' is almost perfect, at the edge a spot diagram smaller than 10' is considered excellent. The top left shows 2' and 5' circles.
There is no trace of coma left in the Houdini spot diagrams. Some spherical aberration and some lateral color remain, which shows on very bright objects, such as a magnitude 1 star or Jupiter, at the edge of the field. This is not visible at all in a typical deep sky field that does not contain magnitude 1 stars. Such a field will appear essentially sharp from edge to edge.
Other Information
- Country of Manufacture: China
Houdini Eyepiece Performance
The following graph illustrates the performance of the Houdini eyepieces in a F/4 Newtonian telescope. Spot diagrams with 3,000 rays are shown at the center, halfway, and near the edge of the field.
The spots have been strongly magnified to show them clearly. In the center of the field a spot diagram smaller than 2' is almost perfect, at the edge a spot diagram smaller than 10' is considered excellent. The top left shows 2' and 5' circles.
There is no trace of coma left in the Houdini spot diagrams. Some spherical aberration and some lateral color remain, which shows on very bright objects, such as a magnitude 1 star or Jupiter, at the edge of the field. This is not visible at all in a typical deep sky field that does not contain magnitude 1 stars. Such a field will appear essentially sharp from edge to edge.
| Manufacturer | Houdini Telescopes |
|---|---|
| Eyepiece Series | Coma Correcting |
| Focal Length | 17mm, 12mm, 20mm |
| Barrel Size | 1.25" (31.75 mm), 2" (50.8 mm) |
| Apparent Field of View (Mfg Specified) | 86° |
| Apparent Field of View (Measured) | 86° |
| Eye Relief (Designed) | 20mm, 19mm |
| Eye Relief (Useable) | 15mm |
| Filter Threads | Standard 2" Filter Thread (M48 x 0.75), Standard 1.25" Filter Thread (M28.5 x 0.6) |
| Blackened Lens Edges | Yes |
| Barrel Type | With safety kerfs |
| Protective Storage Container Included | No |
| Protective Plastic Storage Container Size (Sold Separately) | Agena 52x120mm (1x), Agena 65x120mm (2x) |
| Optical Design | Coma-correcting |
| Rubber Eye Guard | Yes - Rubber Eyecup |
| Country of Manufacture | China |
Set of three coma-correcting eyepieces; the perfect starter package for any Newtonian telescope owner. This set contains the three most used focal lengths. Check out their individual specifications here:
- Coma-Correcting Optics: Built-in correction delivers sharp, pinpoint stars all the way to the edge of its ultra-wide 86° field, especially in Newtonian telescopes.
- Ultra-Wide 86° Apparent Field: Provides an immersive, space-walk viewing experience with expansive views ideal for deep-sky observing.
- Glow-in-the-Dark Focal Length Marking: The illuminated marking makes it easy to identify the eyepiece at night without ruining your dark adaptation.
- Broad Telescope Compatibility: Works best with Newtonians and slower f/6+ telescopes, while avoiding fast refractors and coma-free designs where correction isn’t needed
Houdini Eyepiece Performance
The following graph illustrates the performance of the Houdini eyepieces in a F/4 Newtonian telescope. Spot diagrams with 3,000 rays are shown at the center, halfway, and near the edge of the field.
The spots have been strongly magnified to show them clearly. In the center of the field a spot diagram smaller than 2' is almost perfect, at the edge a spot diagram smaller than 10' is considered excellent. The top left shows 2' and 5' circles.
There is no trace of coma left in the Houdini spot diagrams. Some spherical aberration and some lateral color remain, which shows on very bright objects, such as a magnitude 1 star or Jupiter, at the edge of the field. This is not visible at all in a typical deep sky field that does not contain magnitude 1 stars. Such a field will appear essentially sharp from edge to edge.
Other Information
- Country of Manufacture: China
| Manufacturer | Houdini Telescopes |
|---|---|
| Eyepiece Series | Coma Correcting |
| Focal Length | 17mm, 12mm, 20mm |
| Barrel Size | 1.25" (31.75 mm), 2" (50.8 mm) |
| Apparent Field of View (Mfg Specified) | 86° |
| Apparent Field of View (Measured) | 86° |
| Eye Relief (Designed) | 20mm, 19mm |
| Eye Relief (Useable) | 15mm |
| Filter Threads | Standard 2" Filter Thread (M48 x 0.75), Standard 1.25" Filter Thread (M28.5 x 0.6) |
| Blackened Lens Edges | Yes |
| Barrel Type | With safety kerfs |
| Protective Storage Container Included | No |
| Protective Plastic Storage Container Size (Sold Separately) | Agena 52x120mm (1x), Agena 65x120mm (2x) |
| Optical Design | Coma-correcting |
| Rubber Eye Guard | Yes - Rubber Eyecup |
| Country of Manufacture | China |
Houdini 1.25” and 2” Coma-Correcting Eyepiece Starter Set (7, 12 & 20mm)