William Optics

William Optics Fluorostar 120 - Red

(No reviews yet) Write a Review
Your Price: $4,139.99
Adding to cart… The item has been added

Product Overview

The William Optics FluoroStar 120 Refractor is an air-spaced triplet APO. Using three elements made of high-end fully coated glass like FPL-53 virtually removes chromatic aberration and produces images that are sharp and full of contrast. A patented light weight Bahtinov mask is included to provide assistance in focusing, or you can remove it when using the F120 visually.

The FLT120 has a native focal ratio of f/6.5 and a focal length of 780 mm. The big 3.3" rack and pinion dual-speed focuser allows for use of two optional M92 flatteners from William Optics; the FLAT68III, which flattens the field beautifully without focal reduction, or the FLAT7A, an APO flattener and 0.8X reducer. While the FLAT68III is recommended for the best image quality of the two, the FLAT7A reduces the focal ratio from f/6.5 to f/5.2. Both flatteners accept 2" threaded filters.

As with other William Optics refractors, the fit and finish on the FluoroStar 120 is superb. The telescope comes with cradle style mounting, a saddle handle bar, and a universal Losmandy-style dovetail plate. All four pieces are anodized in red. The included camera rotator and the Rotolock 2" Adapter are anodized to match. This is one beautiful telescope. By the way, the top of the handle bar has a Vixen-style saddle built in to accept William Optics slide base guide rings for a guide scope or finder. You can also use an accessory mounted on a Vixen dovetail.


Model Number
Telescope Series
William Optics FLT
Focal Ratio
Optical Design
Telescope Aperture
120mm (4.72")
Telescope Mount Type
No Mount - OTA Only
Type of Electronics
OTA Only - No Electronics
Number of Refractor Elements
3 (Triplet)
Focal Length (mm)
780 mm
Optical Coatings
Focuser Style
Rack & Pinion
Focuser Size
Focuser Speed
Dual Speed
Refractor OTA Length - Extended (in.)
850 mm
Refractor OTA Length - Retracted (in.)
680 mm
Telescope OTA Weight (lb.)
William Optics - 2 Years


(No reviews yet) Write a Review