Omegon Cronus WA 2.5mm Eyepiece (1.25 inch)

Omegon Cronus WA 2.5mm Eyepiece (1.25 inch): wide-angle eyepiece with 60-degree field of view

The Omegon Cronus WA 2.5mm is a wide-angle eyepiece with a 60-degree field of view and a 16mm eye relief. With this short focal length, you'll get the highest magnifications from your telescope, for nights with a calm atmosphere.

The Cronus series is the affordable entry into wide-field eyepieces: you see about 20 percent more field of view than with a standard Plossl, without a tunnel effect. Objects stay in view longer, which is especially nice with telescopes without a tracking motor.

Comfortable viewing, even with glasses

The 16mm eye relief is generous for this price range. Your eye doesn't need to be exactly on the optical axis to see a full field of view, virtually eliminating black vignetting. Those who wear glasses can observe with them on.

The rotating eyepiece can be adjusted to your preferred distance. Useful if multiple people are looking through the same telescope.

Six-element optics with multi-coating

The six-element lens design features multi-layer coating on all air-to-glass surfaces. This increases light transmission and keeps reflections low, for a high-contrast image with a dark background.

The 1.25-inch barrel has standard filter threads, so you can screw a moon filter or color filter directly under the eyepiece.

What do you see at 2.5 mm?

On a telescope with a 900 mm focal length, a 2.5 mm focal length provides a magnification of 360x. This is only practical with an aperture of at least about 180 mm and stable atmospheric conditions.

Think of the terminator along lunar craters, the Cassini Division in Saturn's rings, and close binary stars. Check beforehand if your telescope can handle this magnification: a realistic maximum is 2x the aperture in millimeters.

Featured accessories

All Cronus eyepieces share the same field of view and eye relief, making it comfortable to switch focal lengths. Combine with an Omegon Moon Filter (1.25 inch) to dim the bright lunar image, or with an Omegon Barlow lens for extra magnification at longer focal lengths.

For whom yes and for whom no

• ✓ Beginners and advanced users who want a wider field of view than a Plössl offers
• ✓ Spectacle wearers, thanks to the 16 mm interpupillary distance
• ✓ Telescopes without tracking motors: objects stay in view longer
• For those seeking a flat field of view all the way to the edge, the Omegon Flatfield series is better suited.
• ✗ Smart telescopes without interchangeable eyepieces

Specifications

You can find more accessories for this merk at the Omegon merk Page.