Celestron Omni eyepiece 1.25 inch, 52° field of view 9 mm
- Omni eyepiece series 1.25 inch
- the short focal length 9 mm Omni eyepiece is a Plössl eyepiece with a four-lens, symmetrical design
- particularly interesting for compact deep-sky objects such as planetary nebulae or globular clusters
- blackened lens edges suppress internal reflections and increase contrast
- the multi-coating on each lens surface allows maximum contrast and light transmission
- in addition, each eyepiece is anodized twice to suppress reflections on the Body - with many other manufacturers you will find reflective surfaces instead
- you can screw all 1 1/4 inch Celestron eyepiece filters into the thread of the eyepiece barrel.
Omni series 1.25 inch - 9 mm
Many inexpensive entry-level telescopes are supplied with cheap eyepieces, which are sufficient for a first look through the telescope, but soon make you wish for something better - a small field of view or an uncomfortably short interpupillary distance make observing difficult. Simple eyepiece designs according to Kellner, Ramsden or Huygens (recognizable by abbreviations such as K, H or SR) are no longer up to date today - even if they are often advertised as "high-performance eyepieces".
Celestron offers an inexpensive alternative with the Omni eyepieces. These are Plössl eyepieces with a four-lens, symmetrical design. Blackened lens edges prevent reflections inside the eyepieces and increase contrast, while the multi-coating on each lens enables maximum contrast and light transmission. In addition, each body is anodized twice to prevent reflections - with other manufacturers you will find reflective surfaces instead.
The eyepieces are pleasantly light and offer a good field of view - it may be smaller than with the much more expensive wide-angle eyepieces, but there is also nowhere near any more annoying tunnel vision. You can screw in any 1.25 inch filters via the filter thread integrated into the eyepiece barrel, e.g. to attenuate the light when observing the moon or to use nebula filters for deep-sky observation.
A retaining groove in the receptacle prevents the eyepieces from slipping out of the focuser and falling to the ground if you swivel the telescope and the clamping screw has come loose.
The Plössl design
Plössl eyepieces are among the first modern eyepiece designs and go back to the Austrian optician Simon Plössl, who developed them back in 1860. It was not until the 1980s that the design became established, as it can be manufactured to a good quality using modern techniques and is far superior to older eyepiece designs. With an apparent field of view of around 50°, they are good, versatile eyepieces that can accompany you for many years. If you are looking for inexpensive eyepieces that are worth the money, the Celestron Omni eyepieces are a good choice.
Only at focal lengths below about 10mm does the eye relief become somewhat small due to the design - spectacle wearers in particular can use the longer focal length eyepieces in conjunction with the 2x Barlow lens. The Barlow doubles the magnification, while the pleasant viewing behavior of the longer focal length eyepieces is not changed.
The 9mm eyepiece
The 9mm model provides a higher magnification on most telescopes and is particularly interesting for compact deep-sky objects such as planetary nebulae or globular star clusters. With the optionally available Omni 2x Barlow lens, you can achieve the higher magnifications required for planets, especially with short focal length telescopes, without having to sacrifice the 6mm eye relief. However, this eye relief is no longer suitable for use with glasses. Observers who are only short-sighted or long-sighted can use the eyepiece without glasses; if the glasses compensate for other visual defects such as astigmatism, a longer focal length eyepiece with a corresponding Barlow lens or a more expensive eyepiece design with a larger eye relief makes sense.
When using a Barlow, you should not magnify too high - the sensible maximum magnification is approximately twice the objective aperture in mm.
Celestron Omni eyepiece 1.25 inch, 52° field of view 9 mm
Short profile
- Omni eyepiece series 1.25 inch
- the short focal length 9 mm Omni eyepiece is a Plössl eyepiece with a four-lens, symmetrical design
- particularly interesting for compact deep-sky objects such as planetary nebulae or globular clusters
- blackened lens edges suppress internal reflections and increase contrast
- the multi-coating on each lens surface allows maximum contrast and light transmission
- in addition, each eyepiece is anodized twice to suppress reflections on the Body - with many other manufacturers you will find reflective surfaces instead
- you can screw all 1 1/4 inch Celestron eyepiece filters into the thread of the eyepiece barrel.
Product description for Celestron Omni eyepiece 1.25 inch, 52° field of view 9 mm
Omni series 1.25 inch - 9 mm
Many inexpensive entry-level telescopes are supplied with cheap eyepieces, which are sufficient for a first look through the telescope, but soon make you wish for something better - a small field of view or an uncomfortably short interpupillary distance make observing difficult. Simple eyepiece designs according to Kellner, Ramsden or Huygens (recognizable by abbreviations such as K, H or SR) are no longer up to date today - even if they are often advertised as "high-performance eyepieces".
Celestron offers an inexpensive alternative with the Omni eyepieces. These are Plössl eyepieces with a four-lens, symmetrical design. Blackened lens edges prevent reflections inside the eyepieces and increase contrast, while the multi-coating on each lens enables maximum contrast and light transmission. In addition, each body is anodized twice to prevent reflections - with other manufacturers you will find reflective surfaces instead.
The eyepieces are pleasantly light and offer a good field of view - it may be smaller than with the much more expensive wide-angle eyepieces, but there is also nowhere near any more annoying tunnel vision. You can screw in any 1.25 inch filters via the filter thread integrated into the eyepiece barrel, e.g. to attenuate the light when observing the moon or to use nebula filters for deep-sky observation.
A retaining groove in the receptacle prevents the eyepieces from slipping out of the focuser and falling to the ground if you swivel the telescope and the clamping screw has come loose.
The Plössl design
Plössl eyepieces are among the first modern eyepiece designs and go back to the Austrian optician Simon Plössl, who developed them back in 1860. It was not until the 1980s that the design became established, as it can be manufactured to a good quality using modern techniques and is far superior to older eyepiece designs. With an apparent field of view of around 50°, they are good, versatile eyepieces that can accompany you for many years. If you are looking for inexpensive eyepieces that are worth the money, the Celestron Omni eyepieces are a good choice.
Only at focal lengths below about 10mm does the eye relief become somewhat small due to the design - spectacle wearers in particular can use the longer focal length eyepieces in conjunction with the 2x Barlow lens. The Barlow doubles the magnification, while the pleasant viewing behavior of the longer focal length eyepieces is not changed.
The 9mm eyepiece
The 9mm model provides a higher magnification on most telescopes and is particularly interesting for compact deep-sky objects such as planetary nebulae or globular star clusters. With the optionally available Omni 2x Barlow lens, you can achieve the higher magnifications required for planets, especially with short focal length telescopes, without having to sacrifice the 6mm eye relief. However, this eye relief is no longer suitable for use with glasses. Observers who are only short-sighted or long-sighted can use the eyepiece without glasses; if the glasses compensate for other visual defects such as astigmatism, a longer focal length eyepiece with a corresponding Barlow lens or a more expensive eyepiece design with a larger eye relief makes sense.
When using a Barlow, you should not magnify too high - the sensible maximum magnification is approximately twice the objective aperture in mm.
Celestron Omni eyepiece 1.25 inch, 52° field of view 9 mm
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