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Eyepieces

The right eyepiece makes all the difference. We offer a wide variety of telescope eyepieces to suit even the most discerning astronomer’s viewing requirements. Whether you are seeking a high magnification eyepiece for planetary observing or low power for deep sky observing and the widest field of view, we have the perfect eyepiece for you.

  • APM 1.25 Inch Coma Corrector ED 2.7x Barlow Element is a photo-visual apochromatic Barlow with real ED glass, designed by Gerd Düring in Germany.
  • APM 1.25 Inch Coma Corrector ED 2.7x Barlow Lens is a photo-visual apochromatic Barlow with real ED glass, designed by Gerd Düring in Germany.
  • APM 1.25 Inch Coma Corrector ED 6.25x Double Barlow Lens is a unique photo-visual apochromatic 2.7x Barlow with real ED glass that be combined with a second APM 2.7x Barlow to increase the magnification factor to 6.25x.
  • APM 10mm Ultra Flat Field Eyepiece delivers high quality in a very compact design and features over-sized lenses for a large 60° field of view with a 20mm eye relief.
  • APM 12mm Flat Field Eyepiece is the perfect all around tool for deep sky, Moon, and planetary viewing. Offering a 60° apparent field of view and multiple coatings for outstanding sharpness and maximum light transmission.
  • APM 13mm HDC Extreme Wide Angle Eyepiece offers a gigantic 100° field of view and multi-coated lenses with lowered chromatic aberration, which provides brilliant contrast and superior light transmission for unforgettable views.
  • APM 15mm Ultra Flat Field Eyepiece delivers high quality in a very compact design and features over-sized lenses for a large 65° field of view with a 16mm eye relief.
  • APM 18mm Ultra Flat Field Eyepiece delivers high quality in a very compact design and features over-sized lenses for a large 65° field of view with a 20mm eye relief.
  • APM 19mm Flat Field Eyepiece is the perfect all around tool for deep sky, Moon, and planetary viewing. Offering a 60° apparent field of view and multiple coatings for outstanding sharpness and maximum light transmission.
  • APM 2 Inch Barlow Lens is well made both in design and craftsmanship, both lenses are fully multi-coated for the best possible contrast and transmission.
  • APM 2 Inch Coma Corrector Telecentric 1.5x Barlow Lens was designed by well known physicist and optical designer Philipp Keller. The telecentric design prevents the need for distance to be individually adjusted for each eyepiece.
  • APM 2 Inch Paralizer Adapter is a high-quality accessory for the APM Coma Correcting Telecentric 1.5x Barlow.  This paralizer has a mechanism to assist with perfect centering and is always kept absolutely parallel in the optical axis.
  • APM 20mm 1.25 Inch Reticle Eyepiece is a high quality wide angle Erfle eyepiece with crosshair.  Offering a 70° apparent field of view for comfortable viewing and easy locating of objects.
  • APM 20mm HDC Extreme Wide Angle Eyepiece offers a gigantic 100° field of view and multi-coated lenses with lowered chromatic aberration, which provides brilliant contrast and superior light transmission for unforgettable views.
  • APM 24mm 1.25 Inch Reticle Eyepiece is a high quality crosshair eyepiece with a comfortable viewing position.  Offering a 55° true field of view to make locating objects easier.
  • APM 24mm Ultra Flat Field Eyepiece
    APM 24mm Ultra Flat Field Eyepiece delivers high quality in a very compact design and features over-sized lenses for a large 65° field of view with a 29mm eye relief.
  • APM 26mm 2 Inch Reticle Eyepiece offers a 70° true field of view to make locating objects easier.  2" barrel.
  • APM 30mm Ultra Flat Field Eyepiece delivers high quality in a very compact design and features over-sized lenses for a large 70° field of view with a 22mm eye relief.
  • APM 30mm Ultra Wide Eyepiece employs a 5-element, non-Erfle design and large 80° apparent field of view. Features fully multi-coated high index glass providing the highest light transmission.
  • APM 8mm Flat Field Eyepiece is the perfect all around tool for deep sky, Moon, and planetary viewing. Offering a 60° apparent field of view and multiple coatings for outstanding sharpness and maximum light transmission.
  • APM Crosshair Eyepiece Illuminator provides an adjustable red light to prevent glare and enhance viewing in dark skies. Powered by button cells.
  • APM M63 Riccardi APO Reducer - Small for APO telescopes shortens the focal length by a quarter and corrects the image circle – thereby converting telescopes into fast astrographs!
  • APM M82 Riccardi APO Reducer - Large for APO telescopes shortens the focal length by a quarter and corrects the image circle – thereby converting telescopes into fast astrographs!
  • Explore Scientific 14mm 100° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 14.5mm of eye relief; Weighs 29.4 ozs./ 1.8 lbs.
  • Explore Scientific 20mm 100° Series Nitrogen-Purged Waterproof Eyepiece; EMD Coatings; 2"; 14.5mm of eye relief; Weighs 38.1 ozs.
  • Explore Scientific 25mm 100° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 14.5mm of eye relief; Weighs 41.5 ozs./ 2.6 lbs.
  • Explore Scientific 30mm 100° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 3"; 19mm of eye relief; Weighs 82.9 ozs./ 5.18 lbs.
  • Explore Scientific 5.5mm 100° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 10.5mm of eye relief; Weighs 21.6 ozs.
  • Explore Scientific 9mm 100° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 12.5mm of eye relief; Weighs 21.2 ozs.
  • Explore Scientific 9mm 120° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 12.5mm of eye relief; Weighs 21.2 ozs./ 1.3 lbs.
  • Explore Scientific 68° 16mm, 24mm, 34mm Argon-Purged Waterproof Eyepiece Set with soft sided case.
  • A curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging. Designed for refracting telescopes, Explore Scientific’s Field Flattener can tackle the edge-of-field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain. This accessory offers fully multi-coated optics and slides securely into the 2” eyepiece holder.
  • A curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging. Designed for refracting telescopes, Explore Scientific’s Field Flattener can tackle the edge-of-field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain. This accessory offers fully multi-coated optics and slides securely into the 2” eyepiece holder. This Flattener includes an ULTRA-THIN Canon T-mount for Canon EOS Digital Cameras.
  • AA curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging. Designed for refracting telescopes, Explore Scientific’s Field Flattener can tackle the edge-of-field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain. This accessory offers fully multi-coated optics and slides securely into the 2” eyepiece holder. This Flattener includes an ULTRA-THIN Nikon T-mount for Nikon Cameras.
  • A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we make focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.
  • The Explore Scientific 2X Focal Extender (2.0-inch O.D.), accepts both 1.25-inch O.D. and 2.0-inch O.D. format eyepieces and camera adapters. Fully EMD-Coated on all air-to-air lens surfaces, with all lens elements edge-blackened to produce superior contrast, this focal extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces such as the 30mm 82 Degree Series Waterproof Eyepiece have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we also make 1.25-inch O.D. Focal Extenders in 2X, 3X and 5x models, so there is something for every style of telescope.
  • Explore Scientific’s 3” Field Flattener .7x Focal Reducer is a multi-faceted accessory designed to enhance your astrophotography experiences. As a field flattener, this piece addresses the edge-of-field aberrations caused by curved focal planes to ensure your night at the eyepiece will result in crisp, true images. As a focal reducer, this device will reduce your f-ratio by .7, which results in a wider field of view, brighter images and less exposure time. Recommended for our 127mm and 152mm refracting telescopes, this field flattener/focal reducer boasts fully multi-coated optics and comes with 2 adapters to accommodate different focuser sizes. While technically this was designed for the F/8 system, through user experiences and our subsequent testing we have concluded that our 3" Flattener / Reducer performs very well with our F/7.5 refractors.
  • A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we make focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.
  • The Explore Scientific 3X Focal Extender (2.0-inch O.D.), accepts both 1.25-inch O.D. and 2.0-inch O.D. format eyepieces and camera adapters. Fully EMD-Coated on all air-to-air lens surfaces, with all lens elements edge-blackened to produce superior contrast, this focal extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces such as the 30mm 82 Degree Series Waterproof Eyepiece have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we also make 1.25-inch O.D. Focal Extenders in 2X, 3X and 5x models, so there is something for every style of telescope.
  • Explore Scientific 5.5mm, 14mm, 26mm and 32mm Series 62° Argon-Purged Waterproof Eyepiece Set with soft case
  • Explore Scientific 100° 5.5mm, 9mm, 14mm Argon-Purged Waterproof Eyepiece Set with soft sided case.
  • A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that's quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we make focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.
  • Explore Scientific 14mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 10.4mm of eye relief; Weighs 3.5 ozs.
  • Explore Scientific 20mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 14.8mm of eye relief; Weighs 5.0 ozs.
  • Explore Scientific 26mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 19.3mm of eye relief; Weighs 8.2 ozs.
  • Explore Scientific 32mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 22.2mm of eye relief; Weighs 14.8 ozs.
  • Explore Scientific 40mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 2"; 28.2mm of eye relief; Weighs 23.6 ozs.
  • Explore Scientific 16mm 68° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 11.9mm of eye relief; Weighs 5.5 ozs.
  • Explore Scientific 9mm 62° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 12.6mm of eye relief
  • Explore Scientific 16mm 68° Series Argon-Purged Waterproof Eyepiece; EMD Coatings; 1.25"; 11.9mm of eye relief; Weighs 5.5 ozs.