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Cyclops Optics

William Optics

  • William Optics FLT-132

    William Optics FLT-132

    William Optics 20th Anniversary Sales — 15% discount 132mm f/7 apochromatic. The FLT-132 gathers 81% more light than the FLT-98 and about 35% higher in resolution.  Fluorostar series (FLT) represents William...

  • William Optics FLT-132 2018 Red

    William Optics FLT-132 2018 HK$29,490.00

    Special 20th Anniversary Offer 132mm f/7 apochromatic refractor. Perhaps the best 5 inch apochromatic refractor under US$4,000. The FLT-132 gathers 81% more light than the FLT-98 and about 35% higher in resolution...

  • William Optics FLT-132 2018 Red

    William Optics FLT-132 2018 with 3.5" Feather Touch & Rotolock HK$36,880.00

      132mm f/7 apochromatic refractor. Perhaps the best 5 inch apochromatic refractor under US$4,000. The FLT-132 gathers 81% more light than the FLT-98 and about 35% higher in resolution.  The FLT132 represents...

  • FLT132 20th Anniversary Limited Edition Gold from Cyclops Optics

    William Optics FLT-132 20th Anniversary Edition HK$29,490.00

    Special 20th Anniversary Offer 132mm f/7 apochromatic refractor. Perhaps the best 5 inch apochromatic refractor under US$4,000. The FLT-132 gathers 81% more light than the FLT-98 and about 35% higher in resolution...

  • William Optics FLT-132 Feather Touch

    William Optics FLT-132 Feather Touch

    132mm f/7 apochromatic. Perhaps the best 5 inch apochromatic refractor in the US$4,000 range. The FLT-132 gathers 81% more light than the FLT-98 and about 35% higher in resolution. Fluorostar series (FLT) represents William...

  • William Optics FLT-98

    William Optics FLT-98

    Fluorostar 98mm f/6.3 apochromatic. Fluostar series (FLT) represents William Optics' top of the line apochromatic designed for astrophotography. FLT-98 is equipped with the beefy 3.5" RotoLock focuser to carry heavy imaging...

  • William Optics FLT-98 Feather Touch

    William Optics FLT-98 Feather Touch

    Fluorostar 98mm f/6.3 apochromatic. Fluostar series (FLT) represents William Optics' top of the line apochromatic designed for astrophotography. Now FLT-98 is equipped with the beefy 3" Feather Touch focuser to carry...

  • William Optics Gran Turismo GT81 II

    William Optics Gran Turismo GT81 II HK$9,390.00

    Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included! The new 2018 GT81 three-element super APO offer superb quality for imaging and visual use at an affordable price!From the pristine white finish on...

  • William Optics Gran Turismo GT81 III

    William Optics Gran Turismo GT81 III

    Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included! The new 2019 GT81 three-element super APO offer superb quality for imaging and visual use at an affordable price!From the pristine white finish on...

  • William Optics Gran Turismo GT81 IV (NEW Model)

    William Optics Gran Turismo GT81 IV (NEW Model) HK$10,980.00

    Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included! The new 2020 GT81 three-element super APO offer superb quality for imaging and visual use at an affordable price!From the pristine white finish on...

  • William Optics GT102 102mm f/6.9 Triplet APO Package

    William Optics GT102 102mm f/6.9 Triplet APO Package HK$14,790.00

    William Optics GT102 APO is a f/6.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-102 reducer cum flattener specially designed for GT102 to transform it into a f/5.5 imaging APO covering full...

  • William Optics GT102 20th anniversary limited edition blue colour with Cyclops Optics free screw smoothing upgrade service

    William Optics GT102 20th Anniversary Limited Edition HK$19,490.00

    In celebration of 20th anniversary at William Optics, a total of 20 units of limited edition William Optics GT102 APO are produced on this very special occasion. The recipe not only includes the amazingly sharp and colour...

  • William Optics GT102 with 3.3" R&P Focuser (New Edition)

    William Optics GT102 with 3.3" R&P Focuser (New Edition) HK$19,980.00 HK$16,480.00

    GT102 2020 Package Includes GT102 three element design with center FPL-53 and other ED element glass (air spaced) All-new 3.3" R & P Focuser with 2 speed knobs 1:10 Mounting rings Innovative Bahtinov Mask...

  • William Optics GT71 71mm f/5.9 Triplet APO 20th Anniversary Limited Edition

    William Optics GT71 71mm f/5.9 Triplet APO 20th Anniversary Limited Edition HK$8,490.00

    William Optics GT71 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-81 reducer cum flattener specially designed for GT71 to transform it into a f/4.7 imaging APO covering full frame...

  • William Optics GT71 with the patented WO Bahtinov Mask Cover

    William Optics GT71 71mm f/5.9 Triplet APO Imaging Package HK$7,990.00

    William Optics GT71 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-III reducer cum flattener specially designed for GT71 to transform it into a f/4.7 imaging APO covering full frame...

  • William Optics GT71 71mm f/5.9 Triplet APO Package

    William Optics GT71 71mm f/5.9 Triplet APO Package

    William Optics GT71 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-81 reducer cum flattener specially designed for GT71 to transform it into a f/4.7 imaging APO covering full frame...

  • William Optics GT81 20th Anniversary Limited Edition

    William Optics GT81 20th Anniversary Limited Edition HK$8,990.00

    William Optics GT81 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-81 reducer cum flattener specially designed for GT81 to transform it into a f/4.7 imaging APO covering full frame...

  • William Optics GT81 81mm f/5.9 Triplet APO Package

    William Optics GT81 81mm f/5.9 Triplet APO Package

    William Optics GT81 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-81 reducer cum flattener specially designed for GT81 to transform it into a f/4.7 imaging APO covering full frame...

  • William Optics GTF81 f/6.6 APO

    William Optics GTF81 f/6.6 APO

    Discontinued and succeeded by William Optics GT81 f/5.9 APO GTF 81 APO is a f/6.6 air-spaced triplet FPL-53 apochromatic with built in doublet ED flattener, a total of 5 elements in two groups design Includes GTF-81...

  • William Optics RedCat 51

    William Optics RedCat 51

    Succeeded by the RedCat 51 Upgraded Version and SpaceCat...

  • William Optics RedCat 51 (Upgraded Version)

    William Optics RedCat 51 (Upgraded Version) HK$6,180.00

    Upgraded version of the popular RedCat 51 APO Accepting order now. Free International Shipping! Please contact for the shipping schedule.     Highlights of the RedCat 51 APO (Upgraded Version) 4 elements...

  • William Optics SpaceCat 51 (Limited Edition)

    William Optics SpaceCat 51 (Limited Edition) HK$6,180.00

    SpaceCat 51 Accepting Order Now! Free International Shipping! Please contact for the shipping schedule.  Highlights of the SpaceCat 51 APO 4 elements Petzval flat field design with FPL-53 optics Fast focal...

  • William Optics Star 71-II f/4.9 APO Astrograph

    William Optics Star 71-II f/4.9 APO Astrograph

    William Optics Star 71-II is the successor to the well-aclaimed Star 71 imaging APO. Star 71-II is a f/4.9 air-spaced 4-element FPL-53 apochromatic refractor. Star 71-II's 45mm image circle is large enough to cover your 35mm...

  • William Optics Star 71-II f/4.9 APO Astrograph with Bahtinov Mask Cap

    William Optics Star 71-II f/4.9 APO Astrograph with Bahtinov Mask Cap

    William Optics Star 71-II is the successor to the well-aclaimed Star 71 imaging APO. Star 71-II is a f/4.9 air-spaced 4-element FPL-53 apochromatic refractor. Star 71-II's 45mm image circle is large enough to cover your 35mm...