FLT 151 Triplet APO

Product Code: A-F151
Price: 266,940NT$

Available Options

Adjustable Reducer/Flattener(P-FLAT4):


Experience the best of the line: the Williams Optics FLT151 Triplet APO f/6.6 Refractor with  All-New 2014 model 3.5" R&P Focuser.

FLT151 Features a top-quality triplet air-spaced objective using outstanding Ohara FPL-53 type glass which provides superb correction for these refractors. In addition, this lens combination provides very high contrast and a flat image field. For visual observing and also with astrophotography you will discover a wealth of detail and tremendously clear image reproduction.

Optically unbeatable

  • Features a top-quality triplet air-spaced objective with FPL-53 glass; 
  • This scope delivers extremely sharp images and has a great color correction. It is ideal for astrophotography.

    R & P Focuser

  • Extra-smooth All-New 2014 model 3.5" R&P Focuser: a treat to use during astrophotography. No more image shifting! 
  • 360 deg. rotatable.
  • Extra-heavy duty.
  • Graduated scale for precise camera alignment
  • Two-speed microfocuser is STANDARD on all units
  • Large aluminum knobs and protection dual speed cap.

    Simply Beautiful Finish

  • Solid CNC-machined mounting rings.
  • Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, red color finish, retractable dewshield, anodized 360 deg. rotatable R&P focuser, dewshield cap. 
  • Despite of its 151mm objective, the scope is still very compact and solid. 
  • Highly precise CNC machined lens cell.

    Total Quality Package

  • 2" & 1.25" adapters included. 
  • All with brass anti-marring compression rings. 
  • 168mm mounting rings included in the price. 
  • Though you will never need it, you have a 2-year warranty from WO, and the certainty that we will be there to assist you even beyond that, if you need!
  • Aluminum knob's protection cover Included .
  • Thermometer knob included .



Aperture 151mm
Focal Ratio F/6.6
Focal Length 998mm
Objective Type Air-spaced Triplet, Apochromatic objective with FPL53 glass.
Lens Shade Retractable
Focuser All-New 2014 model 3.5" R&P Focuser:, rotatable design
Intergrated 1:10 fine focus
100 mm Focuser Travel Length
1.25" Adapter Provided
Type of Mount Mounting Rings
Tube Length 930mm (Fully Retracted) 
1100mm (Fully Extended)
Tube Weight 14 kg



Specification for Apochromatic Lenses



All WO refractors objective are double tested and inspected before shipping to our customer, these telescopes are free of coma and astigmatism.
Since all individual lens surfaces are machine coated sometime it could have visual imperfections which do not affect the objective optical performance.

Dimensions of scratches and points shall not exceed the following values:

Surface finish class Scratches Points Accumulation of defects Width,not more, mm Total length, not more, mm, Diameter no more,mm, Quantity, no more Diameter. 



Scratches Width, not more, mm 0.025mm
Total length, not more 1/4 of total lens diameter. 
Quantity no more
Dots or spot points No more, mm 0.4mm
Quantity, no more 3
Accumulation of defects Limited area, mm 0.8mm^2
Total area of scratches and points, no more, square mm 5.8mm^2


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The William Optics FLT 151 Triplet APO Refractor



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