Explore Scientific FPL-53 Series 165mm f/7 Triplet Refractor



  • Aperture: 165 mm (6.5-inch)
  • Focal Ratio: f/7
  • Focal Length: 1155 mm
  • High-performance astrograph using excellent FPL-53 optics


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  • Regular price $11,999.99

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Explore Scientific FPL-53 Series 165mm f/7 Triplet Refractor

The ED165-FPL53 f/7 Air-Spaced Triplet Apochromatic Refractor Telescope is Explore Scientific's largest refractor telescope. It incorporates their true three-element apochromat design, the ED165-FPL53, with an aperture of 165 mm (6.5-inch) utilizes one of the highest performance extra-low dispersion materials obtainable: Ohara FPL-52 ED Glass.

Combining FPL-53 with optical glass of high refractive index allows this telescope to achieve unprecedented advanced chromatic aberration correction. OHARA FPL-53 is considered one of the best glass types ever produced. Having a true Diffraction-Limited (DL) optical design, this large high-performance refractor  is a perfect grab-and-go instrument for exploring the skies.

Featuring an air-spaced triplet optical design that virtually eliminates chromatic aberrations, this telescope generates brilliant high-contrast images by combining genuine OHARA FPL-53 Extra-low Dispersion (ED) glass and proprietary EMD enhanced multi-layer coatings on all optical surfaces.


Explore Scientific FPL-53 Series 165mm f/7 Triplet Refractor-closed

In addition, this amazing scope also includes a 3-inch Hexagonal focuser with very rigid design and strong support. Up to 10-pounds of gear can be loaded onto this focuser.

Explore Scientific FPL-53 Series 165mm f/7 Triplet Refractor-open

ED165 mm f/7 Air Spaced Triplet with Ohara FPL-53 optics and Integrated Dew Shield; 1155 mm focal length; 3-inch HEX Focuser; Cradle Ring with Handle, and Vixen Style Dovetail Plate; Explore Finder Scope Base installed on scope; 99% Reflective 2-inch Diagonal; and a hard TSA approved carrying case.  (Finder Scope NOT Included)



Aperture165 mm (6.5")
Camera/Eyepiece Connection2"
Dawes Limit0.7 arcseconds
Focal Length1155 mm
Focal Ratiof/7
Free ShippingYes
Glass Type53
Highest Magnification330x
Light Gathering Power556x
Limiting Magnitude14.8
ManufacturerExplore Scientific
Optical DesignTriplet
Plate TypeDovetail Losmandy D
Tube Diameter165mm
Tube Length1041mm
Tube Weight27.6 lbs
WarrantyLifetime Warranty



  • ED115 mm FPL-53 OTA
  • Cradle Ring with Handle and Vixen-Style Dovetail Plate
  • Deluxe Hard Carrying Case (TSA Approved)
  • 99% Reflective 2-inch Diagonal
  • Base for an Explore Finder Scope (installed)