Apochromatic Refractors
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Apochromatic Refractors
We can offer you a range of very high quality refractors in this category. These include e.g. our two- and three-lens APM Apo instruments, our astrograph series, available as APM or APM-LZOS models. Equipped with Riccardi reducers / correctors or as a high-end version CNC LW II with Feathertouch extracts. All around excellent instruments that should leave no wishes.
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
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
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
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
William offers with the REDCAT71 Astrograph a very well corrected telescope for astrophotography up to full frame format.
- Aperture 71 mm / Focal length 350 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 precise helical focuser like 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
- Dual element design with FPL53 glass
- Massive 2.5" R&P focuser
- CNC machined ALU tube
- High quality tube clamps and mounting plate
- Integrated handle
- Two element APO design with FPL53 glass
- Massive 2.5" R&P extension with 1/10 gear reduction
- High quality CNC machined ALU tube
- With tube clamps, mounting handle and mounting plate
The special feature of the 140mm SD APO:
- Very high quality processed and of convincingly good optical quality
- Colorless optics with FLP53 glass
- Precise 2.5" focuser with 1:10 mirco reduction for heavy accessories
- With f / 7 ideal for visual
- With f/5,25 ideal for photographic purposes
- &CNC tube rings
- Carry handle
- Very good value for money
- Objective Lens Diameter: 80mm
- Telescope Focal Length: 600mm (f/7.5)
- Dual-Speed 11:1 2” Crayford Focuser (Backlash-Free)
- 2.8" Indexed Focuser Drawtube with 360º Rotatable Adaptor
- Multi-Coated Objective Lens with MHTC coatings
- Image Height 30mm (with optional reducer/flattener)
- Retractable Dew Shield
- Drawtube Adaptor to accept 2" Star Diagonal
- Finderscope Mounting Shoe (compatible with ALL Sky-Watcher finderscopes)
- Supplied with Tube Rings with Carrying handle
Oct 15 2025
TS Premium 80 mm f/7 ED apo refractor telescope with improved image quality due to ED objective and 2" rack & pinion focuser for astrophotography and observation
- TSED80F7: Special offer for a limited time. The telescopes are new and have full warranty.
- Premium 80 mm f/7.0 ED 2-element objective with improved chromatic correction and good light sensitivity - glas from Ohara (Japan)
- Focal length 560 mm - focal ratio f/7
- Outstanding mechanical construction with CNC tube, CNC tube rings and temperature compensated, adjustable lens mounting
- 2" dual-speed rack & pinion focuser - one of the best focusers of the TS product range for high loads
- 2" and 1.25" connection, and M54x0.75 inner thread are available for adaptations
- Very good image field correctors and also reducers for astrophotography are optionally available
- Dovetail GP/EQ5 style is included
- Finder shoe for finder scopes and small guidescopes is included
