William Optics Apochromates

The various apochromats from William Optics USA are very popular in the astro community. The manufacturer offers innovative ideas and a large selection of different apochromatic designs that can be universally equipped.

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Test report Interferogram
149.00 €
Delivery date : Unbekannte Lieferzeit
Test report with autocollimator
99.00 €
Delivery date : Unbekannte Lieferzeit
From the beginning, the goal was to create the best possible design for an affordable, small, lightweight, and fast Apochromatic refactor for astrophotography.


  • 4 lens Petzval optical design
  • Aperture 51mm, focal lenght 250mm, f/4.9
  • Massive OTA from Aluminum alloy
  • Compact and ultra portable
  • Field rotator
  • Helical focuser design
  • Tilting platform
  • Field illumination even for full frame sensors
1190.00 €
Delivery date : 1-2 weeks
William offers with the REDCAT61 Astrograph a very well corrected telescope for astrophotography up to full frame format.
  • Aperture 61 mm / Focal length 300 mm / Focal ratio f/4.9
  • Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups)
  • Very well corrected and illuminated image field up to full frame format - the corrector is built in - no more adapter battle necessary
  • Camera connection via M48 male thread (suitable adapters are available) - working distance 55 mm
  • 360° rotation of the camera for the right display window
  • Focusing via internal focusing (William Internal Focus Design - WIFD) as with telephoto lenses
  • Tilting option for individual adjustment of the camera sensor to the telescope
  •  Flexible dovetail bar at the base (long version), suitable for Vixen style and Arca-Swiss saddle plates, in addition with 1/4" female photo tripod thread
  • Nylon carrying bag and Bahtinov mask for astrophotography are included in delivery
1899.00 €
Delivery date : 3-4 weeks
This three-lens apochromat with FPL-53 element and STM coating delivers color-pure, crisp images! Stars are pin sharp points, bright objects like moon and planets show no color fringes, but a lot of details!


  • 3 lens Apochromat with FPL-53 element
  • Aperture132mm, focal lenght 910mm, f/6.9
  • Optimized OTA
  • Attachable WO flatteners / correctors
  • 3.3" R&P focuser
  • Field illumination even for full frame sensors
5490.00 €
Delivery date : 3-4 weeks
The APO refractor Fluorostar has a three-lens air-gap objective using the ED special glass FPL-53 from Ohara, Japan, and glass made of lanthanum.


  • 3 lens air spaced FPL-53 / lanthanum design
  • Aperture156mm, focal lenght 1217mm, f/7.8
  • Optimized OTA
  • Attachable WO flatteners / correctors
  • 3.7" R&P focuser
  • Field illumination even for full frame sensors
8449.00 €
Delivery date : 3-4 weeks
Discover the universe in breathtaking clarity with the William Optics Fluorostar 120 Telescope!

Key data:
  • High quality 3 lens optics with FPL53 lenses
  • CNC tube
  • Massive 3.3" R&P focuser with 1:10 reduction ratio
  • Focal length 780mm
  • Aperture 120mm
  • Focal ratio f/6.5
  • APS-C and Fullframe Format

4790.00 €
Delivery date : 3-4 weeks

The new ZenithStar 61 are the most versatile and lightest apos from William Optics.

  • High-quality optics with FPL53 lenses
  • Universally applicable for nature and astronomical observations
  • Ideal for astrophotography
  • An ideal travel instrument
  • Precise R&P focuser with 1:10 gear reduction
799.00 €
Delivery date : 3-4 days

The FLT 91 is the perfect apochromatic refractor for visually and photographically observing astronomers who demand the most from a medium-sized telescope.

  • Three-element design with FPL53 glass
  • 91 mm aperture, 540 mm focal length
  • Rack and pinion focuser with gear reduction and "Rotolock" clamp
  • Field rotator with degree markings and position lock
  • Prism rail according to Vixen standard
  • Versatile handle with Vixen standard finder shoe
  • William Optics' patented Bahtinov mask

Colour variants:

  • Red (standard)
  • Grey
  • Gold
3190.00 €
Delivery date : 3-4 days

The Gran Turismo refractor is an apochromatic triplet with FPL-53 element for highest colour purity and strong contrast! A refracting telescope that is versatile and leaves little to be desired.

  • An ideal travel instrument
  • High-quality 3-lens optics
  • Can be used visually and photographically
  • 2.5" focuser with 1:10 gear reduction
  • Supplied with focus mask according to Bahtinov
1190.00 €
Delivery date : 1 week

The William Optics GT 81 apo stands for optimal chromatic correction and best possible contrast - a powerful travel telescope for observation and photography.

  • Aperture 81 mm
  • Focal length 480 mm
  • Focal ratio f/5.9
  • Multicoated FPL53 triplet lens with air gap
  • 2.5" RAP focuser with M63x1 connection thread, as well as 2" and 1.25
  • Multifunction handle with holder for guide scopes
  • Bahtinov mask integrated
  • Variable carrier bag
  • Vixen/EQ5 style dovetail bar
1550.00 €
Delivery date : 1-4 days

Innovative and revolutionary William Optics design combines precise internal focusing with the highest quality optics available to create the ultimate apochromatic refractor for astrophotography

  • FPL53 Triplet Lens
  • Aperture 81 mm, focal length 480 mm
  • Internal focusing prevents image shift and vignetting
  • Saddle bar handle for mounting the guiding telescope
  • Incl. test report
  • Incl. carrying bag
1999.00 €
Delivery date : 1 week