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Product Details

Explore Scientific 52° Series Waterproof Eyepieces

• • Explore Scientific Waterproof Eyepieces - Comfort, Quality, Value. The Explore Scientific 52° Series eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossol.

  Another great benefit of these eyepieces is the excellent contrast and ease with which you can gaze, not directly at an object, but slightly to either side. This skill, called using averted vision, is especially helpful when observing faint objects, because using averted vision puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.
  

  • Explore Scientific 52° Series 6.5mm Waterproof Eyepiece
    

  Mid-range high power eyepieces like the 6.5mm are instrumental when transitioning through magnifications to observe an object until it is best seen. There are several aspects that have to come together when observing at high powers: good-to-perfect atmospheric seeing conditions; telescope optics that are collimated; a telescope that is acclimated to the ambient temperature; brightness and size of the object being observed are just a few aspects to consider. The observing challenges are high, but the rewards of observing at high power with razor sharp views are unforgettable.

  
  
  

  Item Number	EPWP5265–01
  Focal Length	6.5mm
  Length	103.5mm
  Width	43mm
  Weight	226.8 grams; 8 oz.
  Barrel Size/Type	1.25" O.D. / Double Taper
  Eye Relief	15.9mm
  Field Stop Diameter	5.9mm
  Coatings	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	6 Elements in 3 Groups; Edge Blackened
  Filter Thread	Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand

  
  

  
  

  

  
  
  

  
  

  Explore Scientific 52° Series 10mm Waterproof Eyepiece

  Eyepieces at or near the 10mm range are often considered a mandatory focal length in your collection, as this focal length range is departure point from medium power eyepieces for most telescopes for amateur astronomers. Fainter deep sky objects that do not have the inherent brightness to be observed at higher powers are often perfect for a 10mm. Explore Scientific Waterproof Eyepieces - Comfort, Quality, Value. The Explore Scientific 52° Series eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossl.

  Item Number	EPWP5210–01
  Focal Length	10mm
  Length	83mm
  Width	43mm
  Weight	181.4 grams; 6.4 oz.
  Barrel Size/Type	1.25" O.D. / Double Taper
  Eye Relief	16.6mm
  Field Stop Diameter:	9.1mm
  Coatings	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	6 Elements in 3 Groups; Edge Blackened
  Filter Thread	Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand

  
  

  
  

  

  
  

  
  

  
  

  Explore Scientific 52° Series 15mm Waterproof Eyepiece
  
  

  Solidly in the mid-magnification range for most amateur telescopes, the 15mm is a true workhorse for visual observers. If you love deep sky observing, eyepieces in this focal length range not only give healthy increases in magnification, but the contrast enhancement of giving a darker background sky can make all the difference of how galaxies and nebulae appear under suburban skies.

  Item Number	EPWP5215-01
  Focal Length	15mm
  Size	(L) 93mm x (W) 43mm
  Weight	206 g/7.3 oz
  Barrel Size/Type	1.25" (31.7mm) / Tapered barrel
  Eye Relief	16.3mm
  Field Stop Diameter	15.5mm
  Coatings	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	6 in 3 groups
  Filter Thread	Standard 1.25" Filter Thread (M28.5 x 0.6)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand

  
  

  
  

  

  
  

  
  

  
  
  

  Explore Scientific 52° Series 20mm Waterproof Eyepiece

  Often considered the perfect mid-range focal length for most amateur telescopes, the 20mm on the ED127 at f7.5 produces a 1 degree true field of view. Perfect for the Messier Marathon, or running down the Herschel Catalog. The 20mm 52° Series is also a good selection for most binoviewers with its relatively small size and magnification range.

  
  
  

  Item Number	EPWP5220–01
  Focal Length	20mm
  Length	71mm
  Width	43mm
  Weight	181.4 grams; 6.4 oz.
  Barrel Size/Type	1.25" O.D. / Double Taper
  Eye Relief	15mm
  Field Stop Diameter:	18.2mm
  Coatings:	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	5 Elements in 3 Groups; Edge Blackened
  Filter Thread	Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand

  
  

  
  

  
  

  
  

  Explore Scientific 52° Series 25mm Waterproof Eyepiece

  
  

  Long considered the “standard” eyepiece that is often supplied with telescopes that are sold by various suppliers, the 25mm focal length category is perhaps the most used eyepiece in the world. Like the 20mm, these eyepieces are great for binoviewer devices, and the 25mm is probably the longest focal length of the mid-power range eyepieces before you get into longer focal lengths.

  
  
  

  Item Number	EPWP5225–01
  Focal Length	25mm
  Length	67.7mm
  Width	43mm
  Weight	181.4 grams; 6.4 oz.
  Barrel Size/Type	1.25" O.D. / Double Taper
  Eye Relief	16.4mm
  Field Stop Diameter	18.2mm
  Coatings	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	4 Elements in 2 Groups; Edge Blackened
  Filter Thread	Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand

  
  

  

  Explore Scientific 52° Series 30mm Waterproof Eyepiece

  Loved by deep sky observers, a 30mm focal length eyepiece produces a large exit pupil which floods your dilated eye with light, which is needed to see faint galaxies and nebulae. Low power eyepieces are very important to observers for a variety of reasons: Their wide true field of view make object location and pointing far easier.; Many deep sky objects are large and are best viewed at the lowest magnifications your telescope/eyepiece combination can achieve. When seeing conditions are poor, objects will often still look sharp at low powers.

  
  
  

  Item Number	EPWP5230–01
  Focal Length	30mm
  Length	75.5mm
  Width	47.8mm
  Weight	204.1 grams; 7.2 oz.
  Barrel Size/Type	1.25" O.D. / Double Taper
  Eye Relief	19.9mm
  Field Stop Diameter	27.2mm
  Coatings:	EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
  Lens Elements/ Groups	4 Elements in 2 Groups; Edge Blackened
  Filter Thread	Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
  Waterproof	O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
  Eyecup	Removable Flip-Down Style Soft Silicone Rubber
  Lens Caps	Slide-on Top and Bottom
  Materials	Optical Glass; Aluminum; Steel; Silicone Rubber
  Markings	Laser Engraved: Focal Length; Series; Serial Number; Brand