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.
- 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
The TS 102 mm f11 SDP Apo offers excellent chromatic aberration correction by pairing FPL53 with additional special glass
- Very good correction of chromatic aberrations by a 2-element APO lens with FPL53 from Ohara and an additional special glass
- Very good correction also in the violet color range, where faster SD-Apos give in a bit
- Even at 250-300x sharpness is maintained
- Adjustable lens mount
- Improved 2.5" rack and pinion RAP focuser with photo thread, 2" and 1.25" adaption
- Retractable dew shield for better transport and optimal protection against stray light
- Deluxe finder holder for adapting finder telescopes
- Binoviewers can be used without path compensation
- CNC tube rings and EQ5 style dovetail bar included
- With only 4.6 kg the ED is well supported by mounts like the Skywatcher EQ5
- Each TS Apo is individually tested before shipping (optics, mechanics, cosmetics), a checklist is attached.
- 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
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
Characteristics:
- 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
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
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 fast 110 mm ED APO offers good chromatic correction through two special glasses, it is designed for observation and astrophotography.
- Aperture 110 mm / focal length 660 mm / focal ratio f/6
- 2-element APO objective with FPL51 and Lanthanum glass from Ohara-Optics
- Full multicoating for high contrast
- 2.7" RAP focuser with ball bearing, 360° rotation and micro reduction
- M74x1 female thread for screw adaptions
- CNC tube rings - aluminium tube - retractable dew shield
- Aluminium carrying case
- Made in Taiwan
The TS 110 mm ED with 770 mm focal length is a transportable telescope for astrophotography and for observing with good color correction.
- Aperture 110 mm / focal length 770 mm / focal ratio f/7
- ED Dublet objective with glass from Ohara (Japan)
- Good correction of color error by ED element up to magnifications around 220x
- Stable 2.5" RAP focuser with 2", 1.25" ring clamp and auxiliary thread for screw adaptions
Dual-speeed and 360° rotation of the focuser - important for astrophotography - 0.8x reducer and corrector for astrophotography specially calculated for the TS 110 mm f/7 ED available
- Only 65 cm transport length and 6.8 kg weight - is well supported by a mount of the EQ5 class
- Optimized CNC tube with retractable dew cap and CNC clamps with M6 female thread connection
- Vixen level dovetail bar with photo tripod connection thread included
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
